Michael S. Porter
Eric C. Nordby
Not every birth injury announces itself in the delivery room. Some are visible right away. A baby may have difficulty breathing, show signs of muscle weakness, or experience seizures in the hours after delivery. But other injuries are quieter. Their signs surface gradually, appearing only as a child grows and begins missing the milestones that healthy development should bring.
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For many New York families, the moment they begin to suspect something happened during birth does not come in the hospital. It comes months or even years later, when a toddler is not walking yet, a child struggles to use one arm, or a school-age child is having unexpected learning challenges. By that time, parents are often left wondering what the injury was, whether it could have been prevented, and why no one identified it sooner.
This guide is designed to help you understand why birth injuries are sometimes missed or misunderstood early on, which conditions are most commonly diagnosed late, what signs to watch for, and what steps you can take as a parent when you suspect your child may have been harmed during birth.
What Counts As A Birth Injury
A birth injury is physical harm that occurs to a baby before, during, or shortly after delivery. This is different from a birth defect, which develops during pregnancy due to genetic or developmental factors. Birth injuries involve damage to the brain, nerves, bones, or soft tissue that results from what happens during the labor and delivery process itself.
Some birth injuries are the result of unavoidable complications. Others occur when medical professionals fail to respond appropriately to warning signs, use delivery tools incorrectly, delay a necessary cesarean section, or miss signs of oxygen deprivation. According to data published in the NIH/NCBI StatPearls reference on birth trauma, the birth trauma rate in the United States fell from 2.6 per 1,000 live births in 2004 to 1.9 per 1,000 live births in 2012, reflecting improvements in obstetrical technique and wider use of cesarean delivery in difficult cases. Rates continue to vary depending on facility, delivery method, and individual risk factors.
The severity of birth injuries ranges widely. Some resolve on their own within days or weeks. Others cause permanent damage that affects a child for life. Understanding this spectrum matters, because the milder or less obvious end of that spectrum is precisely where delayed diagnosis is most likely to occur.
Why Some Birth Injuries Are Not Diagnosed Right Away
There are several interconnected reasons why a birth injury may go unrecognized in the newborn period.
The injury affects systems that are not fully tested at birth. A standard newborn evaluation checks breathing, heart rate, skin color, reflexes, and muscle tone. These checks are valuable, but they are not designed to identify every type of neurological or developmental injury. Some damage to the brain or nervous system simply does not produce observable signs in the first hours or days of life.
The brain is still developing. In infants, the brain continues to mature rapidly after birth. Damage that occurred during delivery may not produce noticeable effects until the child reaches developmental stages where the affected functions are actually needed. A motor skill delay, for example, cannot be detected until a child is old enough to attempt rolling over, sitting, or walking.
Babies compensate in ways that mask problems. Young children are remarkably adaptive. A baby with early signs of one-sided weakness may simply prefer one side without raising immediate concern. A child with mild cognitive effects from oxygen deprivation may appear to be developing normally until academic or language demands exceed what the injury allows.
Symptoms overlap with other conditions. Developmental delays, speech difficulties, balance problems, and muscle tone issues can have many causes. When a child shows these signs, birth injury may not be the first explanation a pediatrician considers, especially if the delivery appeared to proceed without serious incident on the medical record.
Early imaging is not always performed. Not every newborn receives a brain MRI or CT scan. Testing is typically ordered when there are clear clinical indicators such as seizures, low Apgar scores, abnormal tone, or suspected hypoxic injury. Milder presentations may not trigger immediate imaging, leaving some injuries undocumented until symptoms become more pronounced.
Families are not always given full information. In some cases, parents are not adequately informed about complications that occurred during delivery. Without knowing there was a difficult labor, a cord compression event, or a delayed emergency response, parents have no reason to monitor for signs of a related injury.
Birth Injuries That Are Commonly Diagnosed Late
Research published in a 2025 review in Current Opinion in Pediatrics confirms that early diagnosis of cerebral palsy specifically remains a persistent challenge, with many children not receiving a formal diagnosis until 12 to 24 months of age or later, even though tools for earlier detection now exist. This pattern of delayed recognition is not limited to cerebral palsy. It holds for several of the most serious birth injury conditions.
Cerebral palsy
Cerebral palsy is a group of movement disorders caused by damage to the developing brain. According to the Centers for Disease Control and Prevention (CDC), cerebral palsy affects approximately 1 in 345 children in the United States and is the most common motor disability in childhood.
Despite how common it is, cerebral palsy is frequently not diagnosed until a child is between 12 and 24 months old. This is because the condition becomes apparent through missed motor milestones, abnormal muscle tone, and movement difficulties that only emerge as a child grows. A baby with spastic cerebral palsy may seem slightly stiff or fussy early on, but the full extent of the difficulty often is not clear until the child struggles to sit, crawl, or walk at expected ages.
Some signs that may appear earlier and warrant evaluation include unusual muscle stiffness or floppiness, persistent use of only one hand or arm, crossing of the legs when picked up, and feeding difficulties in newborns.
Hypoxic-ischemic encephalopathy
Hypoxic-ischemic encephalopathy, or HIE, is a type of brain injury caused by reduced oxygen and blood flow to the brain around the time of birth. It is the most common form of acquired brain injury in full-term infants. Moderate and severe cases often produce immediate signs such as seizures and abnormal tone, but milder cases can be subtler. Children with mild HIE may appear to progress normally at first and only show signs of cognitive, learning, or behavioral difficulties later in early childhood.
HIE is increasingly treated with therapeutic hypothermia, also called cooling therapy, in the neonatal period. This treatment must be initiated within hours of birth to be effective, which is why unrecognized HIE represents one of the most time-sensitive missed diagnoses in newborn medicine.
Brachial plexus injuries and Erb’s palsy
The brachial plexus is a network of nerves that controls movement and sensation in the shoulder, arm, and hand. Brachial plexus birth injuries typically result from stretching or tearing of these nerves during delivery, often in cases involving shoulder dystocia, a difficult fetal position, or the use of forceps or vacuum extractor. According to the NIH/NCBI StatPearls reference on birth trauma, brachial plexus injuries occur in up to 2.5 per 1,000 live births.
In mild to moderate cases, parents may notice that a baby holds one arm in an unusual position or does not move it as freely as the other. These signs can be mistaken for a positional preference or a minor strain, delaying formal evaluation. Recovery depends heavily on early intervention, and children who go undiagnosed and untreated may face more lasting functional limitations.
Periventricular leukomalacia
Periventricular leukomalacia, or PVL, is a form of white matter brain injury that occurs most often in premature infants. It results from damage to the tissue near the fluid-filled spaces of the brain, affecting the nerve fibers that carry signals from the brain to the muscles of the body. Children with PVL may be diagnosed with cerebral palsy as they develop, and many show signs of motor delays, vision impairment, or cognitive difficulties that become clearer over time. Because PVL primarily affects premature newborns, some families may initially attribute early developmental concerns to prematurity alone, without considering that a preventable injury may have contributed.
Neonatal stroke
Perinatal strokes can occur before, during, or shortly after birth and may involve blockage or bleeding in cerebral blood vessels. They are not always obvious in the newborn period. Some infants show seizures or feeding difficulties early on, but others appear relatively normal until motor asymmetry, speech delays, or learning differences become apparent later in childhood. Neonatal stroke may go unrecognized for months in the absence of targeted imaging.
A Timeline Of When Signs May Appear
Because birth injury signs often surface in stages, parents may find it helpful to understand which warning signs tend to appear at different ages.
At birth and during the first days: Difficulty breathing or low Apgar scores; seizures or abnormal movements; extremely floppy or stiff muscle tone; feeding difficulties and poor suck reflex; unusual positioning of an arm or limb; high-pitched or persistent crying.
During the first six months: Persistent feeding problems; limited head control by three to four months; asymmetry in arm movement or limb use; excessive stiffness or limpness; not reaching or grasping by four months; unusual reflex responses.
Between six months and one year: Not sitting independently by nine months; not babbling; not responding to sounds; strong preference for one hand well before the typical age of hand preference; limited or absent crawling; repeated unexplained fussiness or sleep disruption.
Between one and three years: Not walking by 18 months; walking on toes or with an unusual gait; loss of skills previously gained; limited or absent speech; very stiff or very floppy limbs; difficulty with balance or coordination; recurrent unexplained seizures.
After age three: Difficulty with fine motor tasks like drawing or holding utensils; learning difficulties that emerge in a structured classroom setting; attention or behavioral challenges that do not respond to typical supports; sensory processing differences.
Not all of these signs point to a birth injury. Many have other explanations, and every child develops at a slightly different pace. However, if your child experienced a difficult delivery and is showing several of these signs, the combination warrants careful evaluation by a specialist.
Why Early Diagnosis Matters For Treatment Outcomes
The connection between early diagnosis and better outcomes is well supported in the medical literature. The 2025 review published in Current Opinion in Pediatrics (PubMed PMID 39831770) confirms that CP diagnosis should not be delayed and that early imaging combined with motor and neurological evaluation can aid in detection before five months of age. Early therapeutic intervention can meaningfully influence function and help prevent secondary complications.
For conditions like HIE, the treatment window is measured in hours after birth. For brachial plexus injuries, the best outcomes from physical therapy and, when necessary, surgical repair, are achieved when treatment begins within the first months of life. For all movement and developmental disorders related to birth injury, early enrollment in physical therapy, occupational therapy, and speech therapy can significantly affect a child’s long-term trajectory.
When diagnosis is delayed, these intervention windows may be missed. A child who might have made meaningful gains through early therapy may face more significant long-term limitations simply because the injury was not identified in time.
This is why trusting your instincts as a parent matters. You observe your child every day. You notice when something seems off even when you cannot name it. If your child’s development does not feel right, asking for a referral to a developmental pediatrician or pediatric neurologist is always appropriate.
How Children Compensate And Mask Underlying Injury
One of the most counterintuitive aspects of birth injury diagnosis is that children can appear to be doing well while an underlying condition goes unaddressed. Young children are developmentally flexible in ways adults are not. Their brains are still forming connections, and in many cases, unaffected areas of the brain can partially compensate for areas that were injured.
This compensation is real and valuable. It is part of why early intervention can help. But it also means a child may reach some milestones, appear responsive and engaged, and still have an injury that will become more apparent as developmental demands increase.
A child with a mild brachial plexus injury may learn to adapt movements to favor the stronger arm without ever having been evaluated or treated. A child with mild HIE effects may navigate early childhood relatively well and only begin to struggle when language and academic demands in a classroom setting exceed their underlying capacity.
Parents and pediatricians sometimes miss the signal beneath the adaptation. This is not a failure of observation. It is simply a feature of how birth injuries interact with developing neurology. But it underscores why parents should not accept reassurance alone when something continues to feel wrong over time.
Documenting Concerns And Advocating For Your Child
If you suspect your child may have a birth injury that has not been formally identified, there are concrete steps you can take.
Keep a written record. Document every developmental concern with dates and descriptions. Note when a milestone was expected and whether your child reached it. Record any unusual behaviors, physical signs, or medical appointments related to those concerns.
Request copies of delivery and NICU records. You have a right to your child’s complete medical records, including labor and delivery notes, fetal monitoring strips, Apgar scores, cord blood gas results, and any NICU documentation. These records can be critical for understanding what happened during birth.
Ask for specialist referrals. If your pediatrician does not share your concerns, you have the right to ask for a referral to a developmental pediatrician, pediatric neurologist, or physical therapist. You can also seek a second opinion at any time.
Do not wait and see if your instincts persist. There is a difference between recognizing that all children develop at different rates and dismissing a genuine pattern of concern. If something consistently seems wrong across multiple areas of development, pursue evaluation. The risk of evaluating a child who turns out to be developing typically is low. The risk of missing a birth injury diagnosis during a critical treatment window is considerably higher.
New York families have access to Early Intervention services, a state-funded program that provides developmental evaluations and therapies for children from birth to age three who show signs of developmental delays or disabilities. Enrolling in Early Intervention does not require a definitive diagnosis and can begin while further medical evaluation is underway. For New York-specific support organizations and programs, the NYBI support resources page lists groups across the state that help families affected by cerebral palsy, brain injuries, and related conditions.
Understanding Your Legal Options In New York
If your child has been diagnosed with a birth injury, or if you have reason to believe a birth injury was caused or worsened by medical negligence during delivery, New York law provides a framework for pursuing accountability and compensation.
Under New York Civil Practice Law and Rules Section 214-a, the standard statute of limitations for medical malpractice is two years and six months from the date of the alleged act or omission. However, CPLR Section 208 extends this deadline when the injured person is a minor. For birth injury cases, this infant tolling provision allows families additional time, but with an important and often misunderstood cap: the lawsuit must be filed within 10 years of the date the injury occurred. This means that even if a child’s diagnosis is delayed by years, the legal deadline is still anchored to the birth event itself, not the date of diagnosis.
This is a critical distinction for families whose child was diagnosed years after delivery. A child diagnosed with cerebral palsy at age four still has a legal clock that started running at birth. Waiting for a formal diagnosis before exploring legal options can, in some cases, result in losing the ability to file altogether.
For more detail on how New York’s statute of limitations applies to birth injury cases, including exactly what the 10-year cap means for your family’s timeline, see the statute of limitations and infant tolling guide.
Compensation in a successful birth injury case may cover medical expenses, therapy costs, assistive equipment, educational support, future care needs, and the pain and suffering your child and family have experienced. New York law does not cap compensatory damages in medical malpractice cases, meaning compensation is tied to actual and projected harm rather than an arbitrary limit.
What To Do If You Suspect A Birth Injury Was Missed
If you believe your child’s injury was not identified as early as it should have been, or that medical staff failed to recognize signs of distress during labor that contributed to the injury, here is a practical starting point.
First, gather the medical records from the delivery. Second, document your child’s current diagnoses, symptoms, and developmental history in writing. Third, consult with a specialist who has experience evaluating birth-related conditions, such as a pediatric neurologist or developmental specialist. Fourth, speak with a birth injury attorney in New York who can review the records and advise whether a legal claim may be warranted. For a clear explanation of what that process involves and how NYBI supports families through it, see the how we help.
You do not need certainty before taking these steps. Families often begin with a strong feeling that something was missed, and that is enough of a reason to investigate further.
Frequently Asked Questions
Can a birth injury really not be diagnosed until my child is a toddler or older?
Yes. Many birth injuries, including cerebral palsy, mild hypoxic-ischemic encephalopathy, and brachial plexus injuries, may not produce clear, recognizable signs until a child begins missing developmental milestones. Because the brain and nervous system are still maturing after birth, the functional effects of some injuries only become apparent as the child grows and faces greater developmental demands. Research confirmed in peer-reviewed literature found on PubMed shows that the majority of CP diagnoses currently occur between 12 and 24 months, and some milder cases are identified even later.
What are the most common signs that a birth injury may have been missed?
Common delayed signs include unusual muscle stiffness or limpness, persistent preference for using only one side of the body, feeding difficulties that extend beyond the newborn stage, failure to reach milestones like sitting, crawling, or walking at expected ages, speech delays, recurring unexplained seizures, and difficulty with coordination or balance. If your child experienced a difficult delivery and is showing several of these signs together, a specialist evaluation is warranted.
Does a normal newborn discharge mean my child definitely was not injured at birth?
Not necessarily. A normal discharge means the standard newborn evaluation did not identify signs of significant injury at that time. Some birth injuries do not produce observable signs in the immediate newborn period, particularly milder neurological injuries or those affecting developmental functions that are not assessed in a routine newborn check. Normal early findings do not rule out an injury that becomes apparent later.
How does a delayed diagnosis affect my legal options in New York?
In New York, the statute of limitations for birth injury medical malpractice claims is generally two and a half years under CPLR Section 214-a. For minors, CPLR Section 208 provides infant tolling, but with a hard 10-year cap measured from the date of the injury, not the date of diagnosis. This means the legal deadline can arrive while a child is still quite young. If a birth injury is diagnosed years after delivery, the remaining legal window may be much shorter than families expect. Consulting with an attorney early is important for preserving your options.
What should I do if my child has a birth injury but I am not sure whether negligence was involved?
Whether or not negligence was involved, families dealing with a birth injury diagnosis benefit from connecting with early intervention services, developmental specialists, pediatric therapists, and condition-specific support organizations. New York’s Early Intervention Program offers evaluations and therapies for children from birth to age three at no cost based on income. For older children, school-based services and pediatric specialty programs are available across the state. The NYBI support resources page lists organizations across New York that provide help for families affected by cerebral palsy, brain injuries, and related conditions. A legal consultation, which is typically free and carries no obligation, can also help clarify whether a medical review is warranted.
Taking The Next Step When Something Feels Wrong
If something about your child’s development has been concerning you, and especially if that concern connects to a difficult delivery, do not let uncertainty hold you back. Reach out to your child’s pediatrician, ask for a specialist referral, and request copies of all records from the birth. You do not need to have every answer before taking the next step. New York families navigating a possible birth injury diagnosis have real medical and legal resources available, and the path forward begins with the willingness to ask the right questions.
This article is provided for general informational and educational purposes only. It is not medical advice and is not intended to replace consultation with a licensed physician, neurologist, or other qualified healthcare provider. If you have concerns about your child’s development or believe your child may have experienced a birth injury, please speak with your child’s doctor or a qualified specialist. This article is also not legal advice. Birth injury cases involve complex medical and legal questions that require individualized evaluation by a licensed attorney. Every child’s situation is different, and outcomes vary based on the specific facts involved.
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Originally published on June 3, 2026. This article is reviewed and updated regularly by our legal and medical teams to ensure accuracy and reflect the most current medical research and legal information available. Medical and legal standards in New York continue to evolve, and we are committed to providing families with reliable, up-to-date guidance. Our attorneys work closely with medical experts to understand complex medical situations and help families navigate both the medical and legal aspects of their circumstances. Every situation is unique, and early consultation can be crucial in preserving your legal rights and understanding your options. This information is for educational purposes only and does not constitute medical or legal advice. For specific questions about your situation, please contact our team for a free consultation.