HIE Symptoms in Newborns

HIE symptoms in newborns

The symptoms of HIE are the signs of a brain that is not working normally in the first hours and days of life: altered alertness, abnormal muscle tone, feeding difficulty, and seizures. Because the injury evolves over time, the signs are not static: a baby may appear one way at birth and worse (or better) hours later. Clinicians track this evolution closely, because it determines both the Sarnat grade and the treatment.

Signs at birth: Apgar and resuscitation

The first clue is often a depressed baby at delivery. A low Apgar score, particularly a score that stays low at 5 and 10 minutes, signals a newborn who is not breathing, moving, or responding normally. Other early signs include:

• No spontaneous cry or weak, gasping breathing
• Poor or absent muscle tone (a “floppy” baby)
• Pale or bluish color that does not improve quickly
• A need for active resuscitation: stimulation, positive-pressure ventilation, or more
• Cord-blood testing showing acidosis (a low pH, evidence of oxygen debt)

A low Apgar alone does not diagnose HIE, but a persistently depressed baby who needed resuscitation is the classic entry point.

Symptoms by Sarnat grade

Clinicians organize the neurological findings by the Sarnat staging system, which maps directly onto severity and prognosis.

The distinction that matters most clinically and legally is mild versus moderate-to-severe: babies at Stage 2 or 3 are candidates for therapeutic hypothermia, which must start within six hours of birth. Recognizing a moderate presentation quickly is therefore essential: see HIE treatment.

Seizures in HIE

Seizures are one of the most important signs of moderate-to-severe HIE and often appear within the first 24 hours of life. Newborn seizures can be subtle: lip-smacking, cycling leg movements, eye deviation, or brief stiffening rather than the dramatic convulsions people expect, which is why continuous EEG monitoring is used in many NICUs to catch them. Seizures both signal significant injury and, uncontrolled, can add to it, so prompt treatment is part of the standard of care.

The NICU course

A baby with moderate-to-severe HIE is typically admitted to the neonatal intensive care unit for close neurological monitoring, EEG, blood-gas testing, and, if eligible, cooling therapy for 72 hours followed by gradual rewarming. Brain imaging, usually MRI, is performed in the days after birth to assess the pattern and extent of injury. The NICU course is where much of the evidence in an HIE case is created: the timing of cooling, the response to seizures, and the imaging findings all live in this record.

Signs that emerge later

Some effects of HIE are not visible in the newborn period and appear only as the child grows: delayed milestones (rolling, sitting, walking), abnormal muscle tone or movement patterns that later meet the definition of cerebral palsy, feeding difficulties, hearing or vision problems, and seizure disorders. Our long-term effects page follows these outcomes by severity.

Why the record of symptoms matters

In an HIE claim, the documented symptoms and their timing are evidence. They establish the Sarnat grade, show whether the baby qualified for cooling, and reveal whether the team recognized and treated seizures and distress promptly. If a moderate presentation was under-recognized and the cooling window was missed, that gap can be central to a claim. Filing deadlines vary by state, and case value is discussed on our HIE settlements page.

Where your case would be handled depends on where the care happened: Banville Law attorneys are licensed in New York and Washington, D.C.; The Weitz Firm attorneys are licensed in Pennsylvania and New Jersey; elsewhere, the alliance connects families with its vetted network of local birth injury attorneys. Special rules apply to care at military or federally funded hospitals.

Related HIE guides

• HIE overview (hub)
• What Causes HIE?
• HIE Treatment & Cooling Therapy
• HIE Long-Term Effects
• Life Expectancy After HIE
• HIE vs. Cerebral Palsy

Frequently asked questions

Does a low Apgar score mean my baby has HIE?

Not by itself. A low Apgar signals a depressed newborn, which raises concern for HIE, but the diagnosis rests on the neurological exam over the following hours, blood-gas evidence of oxygen deprivation, and imaging. Many babies with a low Apgar recover fully.

What do newborn seizures look like?

Often subtle: lip-smacking, bicycling leg movements, eye deviation, or brief stiffening rather than obvious convulsions. Because they are easy to miss, many NICUs use continuous EEG monitoring for babies at risk.

Can mild HIE symptoms still lead to problems later?

Most babies with mild (Stage 1) HIE recover fully. Lasting problems are far more associated with moderate and severe HIE. Follow-up developmental assessment is still recommended so any delays are caught early.

How soon do HIE symptoms appear?

Signs of a depressed newborn are present at birth, and the neurological picture typically evolves over the first hours to days. Seizures, when they occur, most often appear within the first 24 hours of life.

Sources

This page is for general education and is not medical advice. Medical facts above are drawn from the cited primary sources; legal statements reflect the reviewing attorneys’ professional experience. Always consult your child’s physician about medical concerns.