A Parent’s Guide to Understanding Delays After Hypoxic-Ischemic Encephalopathy (HIE)

When your baby is diagnosed with hypoxic-ischemic encephalopathy (HIE), one of the most difficult parts of the journey is waiting to see how your child develops over time. Many parents leave the NICU hoping their baby will “catch up,” only to later notice missed milestones such as delayed rolling, sitting, walking, speech, or feeding.

These delays can feel frightening and confusing. Parents often wonder:

• Is my baby developing normally?
• Will my child eventually catch up?
• Did the oxygen deprivation damage my baby’s brain?
• Could earlier medical intervention have prevented this?

The truth is that many children with HIE experience developmental delays because oxygen deprivation can injure parts of the brain responsible for movement, speech, learning, memory, coordination, and behavior.

Understanding why developmental milestones are missed can help parents recognize warning signs early, access therapies sooner, and better advocate for their child’s future.

Why Developmental Milestones Matter

Developmental milestones are skills most children achieve within a predictable age range.

Doctors monitor milestones because they provide important clues about how the brain and nervous system are developing.

Common developmental milestones include:

Gross Motor Skills

• Holding the head up
• Rolling over
• Sitting independently
• Crawling
• Walking

Fine Motor Skills

• Grasping toys
• Feeding themselves
• Using fingers with coordination

Speech and Language

• Babbling
• Saying first words
• Understanding commands
• Combining words into sentences

Cognitive Skills

• Problem-solving
• Learning
• Memory
• Attention

Social and Emotional Skills

• Smiling
• Eye contact
• Responding to parents
• Interactive play

When HIE damages brain regions involved in these functions, delays may begin appearing during infancy or toddlerhood.

How HIE Causes Developmental Delays

The brain controls every aspect of development. HIE can injure different brain regions depending on:

• How long oxygen deprivation lasted
• How severe the oxygen loss was
• Which brain regions were affected
• How quickly treatment was started

Even mild injury can interfere with developmental progress.

Injury to the Motor Cortex

Damage to motor-control areas can lead to:

• Muscle stiffness
• Poor coordination
• Weakness
• Delayed crawling or walking
• Cerebral palsy

Some babies may initially seem floppy or weak, while others later develop tight muscles or abnormal movement patterns.

Injury to the Basal Ganglia

The basal ganglia help control movement and muscle tone.

Injury here is strongly associated with:

• Dyskinetic cerebral palsy
• Severe movement disorders
• Feeding difficulties
• Delayed mobility

Children with basal ganglia injury often struggle to meet physical milestones on time.

Injury to White Matter

White matter connects different parts of the brain.

Damage can affect:

• Processing speed
• Coordination
• Attention
• Learning
• Executive functioning

These children may not show major delays until preschool or school age.

Injury to Speech and Language Centers

Some HIE babies develop:

• Delayed speech
• Trouble understanding language
• Difficulty communicating
• Oral motor dysfunction

Speech delays are among the most common long-term effects of HIE.

Injury Affecting Feeding and Swallowing

Babies with HIE often struggle with:

• Sucking
• Swallowing
• Oral coordination
• Aspiration risk

Feeding problems themselves can contribute to poor growth and delayed development.

Why Some HIE Babies Seem Normal at First

One of the most confusing aspects of HIE is that some babies appear normal during infancy.

A child may initially:

• Smile normally
• Eat reasonably well
• Move arms and legs
• Pass early newborn exams

But developmental delays may emerge later because higher-level brain skills develop over time.

For example:

• Attention problems may not appear until preschool
• Learning disabilities may not emerge until elementary school
• Fine motor delays may become obvious during writing tasks
• Speech delays may not become clear until language demands increase

This is why long-term developmental follow-up is essential after HIE.

Common Developmental Delays Seen in HIE Children

Every child is different, but common milestone delays include:

Delayed Rolling or Sitting

Babies may have poor muscle control, stiffness, or weakness that makes movement difficult.

Delayed Crawling or Walking

Some children walk months or years later than expected.

Others may require:

• Braces
• Walkers
• Wheelchairs
• Physical therapy

Speech Delays

Children may:

• Speak late
• Have limited vocabulary
• Struggle to form words
• Need speech therapy
• Use assistive communication devices

Feeding Delays

Some babies require:

• Feeding therapy
• Thickened feeds
• G-tubes
• Swallow studies

Learning and Behavioral Delays

School-age children with HIE may struggle with:

• ADHD symptoms
• Memory
• Processing speed
• Executive functioning
• Emotional regulation
• Autism-like features

Does Missing Milestones Mean Severe Disability?

Not necessarily.

Some children with HIE experience mild delays and eventually function independently.

Others may have lifelong disabilities requiring extensive support.

Outcomes depend on:

• Severity of brain injury
• MRI findings
• Presence of seizures
• Timing of cooling therapy
• Access to therapy services
• Individual brain recovery

The developing brain has some ability to adapt, especially with early intervention.

Early Intervention Is Critical

Research consistently shows that early therapy improves outcomes for children with HIE.

Therapies may include:

Physical Therapy

Helps improve:

• Strength
• Coordination
• Balance
• Walking
• Mobility

Occupational Therapy

Helps children develop:

• Fine motor skills
• Feeding skills
• Daily living activities
• Sensory processing

Speech Therapy

Supports:

• Communication
• Feeding
• Oral motor control
• Language development

Developmental Therapy

Focuses on:

• Cognitive development
• Play skills
• Social interaction
• Learning readiness

Parents should not wait for severe delays before seeking help.

If your child had HIE, developmental assessment and monitoring should begin early.

Warning Signs Parents Should Watch For

Parents often recognize delays before doctors do.

Potential warning signs include:

In Infants

• Poor feeding
• Excessive stiffness or floppiness
• Weak cry
• Persistent fisting of hands
• Limited eye contact
• Not rolling over
• Difficulty holding head up

In Toddlers

• Not walking independently
• Limited speech
• Poor coordination
• Frequent falls
• Difficulty using hands
• Lack of social interaction

In Older Children

• Learning difficulties
• Attention problems
• Speech issues
• Behavioral struggles
• Motor coordination problems

If you notice developmental concerns, ask for formal developmental evaluations.

The Emotional Impact on Parents

Watching a child miss milestones can be emotionally devastating.

Parents often describe:

• Grief
• Anxiety
• Guilt
• Isolation
• Fear about the future

It is common to compare your child to other children and wonder what life might have looked like without the birth injury.

Support groups, counseling, therapy teams, and experienced medical providers can help families navigate the emotional realities of raising a child with HIE.

 

Frequently Asked Questions

Can mild HIE still cause developmental delays?

Yes. Even mild HIE can lead to subtle cognitive, behavioral, speech, or motor problems that may not appear until later childhood.

Do all HIE babies develop cerebral palsy?

No. Some children recover well, while others develop cerebral palsy, learning disabilities, epilepsy, or developmental delays.

At what age do delays usually appear?

Some delays appear in infancy, while others become noticeable during toddler years or school age.

Can therapy help HIE children catch up?

Early intervention therapies can significantly improve function and developmental outcomes.

Should parents get long-term developmental follow-up after HIE?

Yes. Children with HIE should receive ongoing developmental monitoring even if they appear normal during infancy.

HIE is a brain injury caused by oxygen deprivation, and some effects may not become obvious until the brain is challenged by more complex developmental tasks later in childhood.

Typical Follow-Up Timeline After HIE

Infancy (0–12 Months)

Focuses on:

• Muscle tone
• Feeding
• Head control
• Early movement
• Vision and hearing

Toddler Years (1–3 Years)

Focuses on:

• Walking
• Speech development
• Coordination
• Social interaction
• Early learning

Preschool and School Age

Focuses on:

• Attention
• Learning
• Executive functioning
• Behavior
• Academic performance
• Fine motor skills

Some higher-level difficulties are not visible until school demands increase.

Final Thoughts

Long-term developmental follow-up is considered essential after HIE because the effects of oxygen deprivation can unfold over time. Even children with mild HIE may later develop subtle motor, cognitive, behavioral, or learning challenges.

Regular monitoring helps ensure:

• Delays are identified early
• Therapies start sooner
• Educational supports are provided
• Families receive appropriate guidance and resources

For many children with HIE, early intervention and long-term support can significantly improve quality of life and developmental outcomes.

You should consider contacting the legal team at hienewborn.com as soon as possible if:

• Your baby has been diagnosed with a condition like hypoxic-ischemic encephalopathy (HIE), cerebral palsy, or another birth-related and has missed some developmental milestones
• You suspect that something went wrong during labor or delivery, or you have concerns about the medical care you or your baby received.