Babies cannot technically be born “addicted” to drugs, but they can be born physically dependent on them. The distinction matters: addiction involves compulsive drug-seeking behavior, which a newborn is incapable of. What actually happens is that a baby exposed to certain substances in the womb develops a physiological dependence, meaning their body has adapted to the drug’s presence and reacts when it’s suddenly cut off at birth. This condition is called neonatal opioid withdrawal syndrome (NOWS), or more broadly, neonatal abstinence syndrome (NAS).
How Drugs Reach the Baby
The placenta, which supplies oxygen and nutrients to a developing baby, also allows many drugs to pass from the mother’s bloodstream into the fetal bloodstream. Most drugs cross the placenta through simple diffusion, the same way a drop of dye spreads through water. Cocaine, for example, dissolves easily into the fatty membranes of the placenta and slips through without any special transport mechanism.
Amphetamines and methamphetamine work differently. They hijack the placenta’s own chemical transporters, essentially riding the same pathways that normally carry brain-signaling chemicals like serotonin and norepinephrine. Once inside the fetus, these stimulants block normal chemical uptake in the baby’s developing nervous system, raising blood pressure and potentially affecting growth.
Because the baby is continuously exposed throughout pregnancy, their developing nervous system adapts to the drug’s presence. When the umbilical cord is cut at birth, that supply stops abruptly, and the baby’s body struggles to function without it.
How Common This Is
The rate of NAS in the United States rose sharply alongside the opioid crisis, climbing from 2.9 per 1,000 hospital births in 2009 to 7.3 per 1,000 in 2017. That means roughly 1 in every 137 babies born in a hospital that year was affected. Rates have remained elevated since then. In Minnesota, for instance, the rate was 6.4 per 1,000 live births in 2024.
What Withdrawal Looks Like in a Newborn
Opioid withdrawal produces the most well-documented set of symptoms, and they typically appear within the first few days of life. The hallmark signs are increased muscle tone, tremors even while the baby is resting, and an exaggerated startle reflex. Babies often have a distinctive high-pitched, continuous cry that sounds different from normal newborn fussiness.
Other symptoms span nearly every body system. The baby may sweat, run a fever, yawn frequently, sneeze repeatedly, and have a stuffy nose or flared nostrils. Feeding problems are common: poor latching, spitting up, vomiting, and diarrhea. Sleep is severely disrupted, with some babies unable to stay asleep for even an hour after a feeding. Their skin may appear mottled or blotchy. In severe cases, seizures can occur.
Benzodiazepines, nicotine, alcohol, and methamphetamine can also cause withdrawal-like symptoms in newborns, though these are less well studied and don’t have as standardized a treatment approach.
How Doctors Assess Severity
Hospitals use scoring tools to track how a baby is doing. The traditional approach, the Finnegan scoring system, assigns points for dozens of specific signs: how long the baby sleeps, the pitch and duration of crying, the severity of tremors, feeding quality, temperature, breathing rate, and gastrointestinal symptoms. Higher total scores indicate more severe withdrawal and help guide whether medication is needed.
A newer model called Eat, Sleep, Console takes a simpler, more family-centered approach. Instead of tallying dozens of clinical signs, it asks three core questions. Can the baby eat an adequate amount? Can the baby sleep undisturbed for at least one hour? Can the baby be comforted within 10 minutes? If the answer to any of these is consistently no despite hands-on comfort measures, that signals the baby may need medication. A meta-analysis found this approach cut the need for medication by more than half compared to the traditional scoring method and significantly shortened hospital stays.
How Babies Are Treated
The American Academy of Pediatrics recommends non-pharmacological care as the first-line treatment. This means skin-to-skin contact, swaddling, a quiet and dimly lit environment, gentle rocking, frequent small feedings, and keeping the baby with the parent rather than in an intensive care unit when possible. Parental involvement is central to the newer care models, and hospitals increasingly manage these babies in regular postpartum rooms to keep families together.
When symptoms are severe enough that comfort measures aren’t working, babies receive small, carefully controlled doses of medication similar to the substance they were exposed to in the womb. The goal is to ease the withdrawal gradually rather than forcing the baby through it abruptly. The dose is slowly tapered down over days or weeks until the baby no longer needs it. For opioid withdrawal specifically, the medications used are themselves opioid-based, with additional options available for babies who don’t respond well to first-line treatment.
Long-Term Effects
Withdrawal itself is treatable and temporary, which is one of the more reassuring aspects of NAS. Most babies recover fully from the acute withdrawal phase. The longer-term picture is more nuanced. A University of Tennessee study that followed children to age 10 found that those with a history of NAS had significantly higher rates of abnormal behavioral development and language delays compared to children without that history. However, the same study did not find significant differences in cognitive or motor development, and patterns of learning disorders were similar between the two groups.
It’s worth noting that separating the effects of prenatal drug exposure from other factors like poverty, unstable home environments, and limited access to early intervention services is extremely difficult. Many of the challenges these children face may reflect their broader circumstances rather than the withdrawal itself.
How NAS Differs From Fetal Alcohol Exposure
Parents sometimes confuse neonatal abstinence syndrome with fetal alcohol spectrum disorder (FASD), but the two conditions are fundamentally different. NAS involves withdrawal symptoms that are visible almost immediately after birth and can be treated. FASD involves structural damage to the developing brain and body caused by alcohol, and most of its effects aren’t noticeable right at birth. They emerge over time as issues with attention, impulse control, speech, language, and sensitivity to sensory input like light, sound, and touch.
The critical difference is that NAS is a temporary, treatable condition. FASD causes lifelong changes that cannot be reversed, only managed. A baby can recover from drug withdrawal. A child with fetal alcohol spectrum disorder will carry its effects permanently.