What Is Neonatal Abstinence Syndrome? Symptoms and Treatment

Neonatal Abstinence Syndrome can feel scary for families because symptoms may appear soon after birth and require close medical attention. This topic connects pregnancy, prenatal opioid exposure, prenatal drug exposure, newborn health, and recovery in ways that many parents do not expect. In this guide, I will walk through neonatal abstinence syndrome NAS, neonatal opioid withdrawal syndrome, possible risks, certain signs, and treatment factors in clear terms.

What Is Neonatal Abstinence Syndrome (NAS) and Neonatal Opioid Withdrawal Syndrome (NOWS)?

Neonatal Abstinence Syndrome is a group of withdrawal symptoms that can affect newborns exposed to opioids or certain other substances before birth. The baby may have trouble feeding, sleeping, gaining weight, calming down, or controlling movement after delivery. Neonatal Abstinence Syndrome can range from mild to severe, so doctors monitor symptoms closely in the first days of life. Early care, safe treatment, and family support can help protect the baby while the parent gets help for substance use, addiction, or co-occurring mental health needs.

How Neonatal Abstinence Syndrome Develops

Neonatal Abstinence Syndrome develops when a baby is exposed to certain drugs that pass from the mother’s bloodstream through the placenta during pregnancy. After birth, the drug supply stops, and the baby’s nervous system may react with withdrawal symptoms.

Severity depends on many factors, including genetic factors, as well as the substance, dose, length of exposure, timing of use, and whether more than one drug was involved.

Common Causes of Neonatal Abstinence Syndrome

Opioids are the most common cause of Neonatal Abstinence Syndrome. These include oxycodone, hydrocodone, morphine, codeine, fentanyl, methadone, buprenorphine, heroin, and illicit fentanyl. Other substances and other drugs may also contribute to newborn withdrawal or withdrawal-like symptoms. These include benzodiazepines, SSRIs, barbiturates, nicotine, cigarette smoking, alcohol, cocaine, methamphetamine, and other stimulants, and some prenatal exposures are also linked to heart defects, low birth weight, or premature birth depending on the substance.

Risk Factors for Neonatal Abstinence Syndrome

Risk factors include:

• Opioid use disorder during pregnancy
• prescribed opioids
• Heroin or illicit fentanyl use
• Methadone or buprenorphine treatment
• Polysubstance use
• cigarette smoking or vaping nicotine
• Alcohol use during pregnancy
• Limited prenatal care
• Depression, anxiety, PTSD, or bipolar disorder
• Limited access to addiction treatment

Signs and Symptoms of Neonatal Abstinence Syndrome

Common symptoms include:

• High-pitched crying
• Irritability
• Tremors or shaking
• Trouble sleeping
• Poor feeding
• Vomiting
• Diarrhea
• Poor weight gain
• Sweating
• Fever
• Rapid breathing
• Yawning or sneezing
• Stuffy nose
• Muscle stiffness
• Seizures in severe cases

Opioid Use During Pregnancy and Neonatal Abstinence Syndrome

Opioids cross the placenta and enter the baby’s bloodstream during pregnancy. Prescription opioids, heroin, illicit fentanyl, methadone, and buprenorphine can all increase the risk of Neonatal Abstinence Syndrome.

In the US, opioid use during pregnancy rose 333% from 1999 to 2014, reflecting an increased risk of adverse infant outcomes. Maternal opioid prescriptions also rose 333% over the same period, contributing to more opioid exposed infants and a higher risk of NAS.

Stopping opioids suddenly during pregnancy can be dangerous. Medical care, prenatal support, and medication-assisted treatment can lower overdose risk and support safer pregnancy outcomes.

Neonatal Abstinence Syndrome Symptoms in Newborns

Newborn symptoms often affect feeding, sleep, movement, breathing, and comfort. Some babies have mild symptoms, while babies suffering severe withdrawal may need longer observation and medication.

Doctors track symptoms to identify significant withdrawal and decide if medication is needed to treat severe withdrawal symptoms.

Babies born after exposure to illicit drugs may have sneezing, poor feeding, tight muscle tone, overactive reflexes, unstable temperature, slow growth, skin breakdown, and other health problems. As the body breaks down and gradually decreases drug levels, some infants may need extra calories, and doctors may monitor for behavior problems.

Early Warning Signs After Birth

Many newborns begin showing withdrawal symptoms within 24 to 72 hours after birth, although symptoms may appear later with long-acting opioids such as methadone or buprenorphine; symptoms are often more apparent in full-term babies than in premature infants. Early recognition allows healthcare providers to begin supportive care before symptoms become more severe.

Premature infants may have a lower risk of noticeable withdrawal and sometimes show less severe symptoms, though close monitoring is still needed.

Parents and healthcare providers should watch for:

• Excessive crying
• Tremors
• Poor feeding
• Trouble sleeping
• Vomiting
• Diarrhea
• Rapid breathing
• Difficulty being soothed
• Fever
• Poor weight gain

How Long Neonatal Abstinence Syndrome Symptoms Last

The length of Neonatal Abstinence Syndrome varies depending on the drug involved, the amount of exposure, and the baby’s overall health. Symptoms from short-acting opioids often begin within one to three days after birth, while withdrawal from methadone or buprenorphine may not begin until several days later.

Many infants improve within a few days to several weeks, although some require medication and longer hospital stays. Babies treated with medication are gradually weaned under medical supervision before going home.

How Is Neonatal Abstinence Syndrome Diagnosed?

Doctors diagnose NAS by reviewing newborn symptoms alongside prenatal history, medication use, and substance exposure. They may also use urine, meconium, or umbilical cord tissue testing, which is more useful when providers receive an accurate report of substance use and timing. Providers may use tools like the Finnegan scoring system or the Eat, Sleep, Console approach to measure symptoms and guide treatment.

Prevalence of Neonatal Abstinence Syndrome

Neonatal Abstinence Syndrome has increased with opioid use during pregnancy, with thousands of newborns diagnosed in the United States each year. NAS rates rose 5-fold from 2004 to 2014, and Medicaid-covered babies increased from 1.3 to 5.8 per 1,000 births. Rates vary by state. Tennessee NAS hospital admissions rose 5-fold, Illinois rates increased 52% from 2011 to 2016, and Wisconsin rates reached as high as 23 per 1,000 births.

Effects and Risks of Neonatal Abstinence Syndrome

Short-Term:

• Feeding problems
• Poor weight gain
• Excessive crying
• Tremors
• Sleep problems
• Vomiting or diarrhea
• Dehydration
• Fever
• Rapid breathing
• Seizures in severe cases
• Longer hospital stays

Long-Term:

• Developmental delays
• Speech or language delays
• Learning problems
• Behavioral issues
• Attention problems
• Motor delays
• Vision or hearing concerns
• Need for early intervention
• Ongoing pediatric follow-up

Co-Occurring Mental Health Conditions During Pregnancy

Many pregnant women with substance use disorders also have mental health conditions that affect pregnancy and recovery. Common co-occurring conditions include depression, anxiety disorders, post-traumatic stress disorder (PTSD), bipolar disorder, panic disorder, obsessive-compulsive disorder (OCD), and trauma-related disorders. When mental health conditions go untreated, they may increase the risk of continued substance use, missed prenatal care, relapse, and poor pregnancy outcomes. Treating both addiction and mental health at the same time often leads to better results for both mother and baby.

Substance Use Disorders and Maternal Mental Health

Opioid use disorder is the most common substance use disorder linked to Neonatal Abstinence Syndrome, but alcohol, methamphetamine, cocaine, cannabis, nicotine, benzodiazepines, and prescription medication misuse can also affect maternal mental health and pregnancy. Many women use substances to cope with depression, anxiety, trauma, or chronic stress before seeking treatment.

Integrated treatment that addresses both substance use and mental health can improve recovery, prenatal care participation, and family stability.

Benefits of Early Screening and Medical Care

Early screening and medical care can:

• Identify substance use early
• Detect mental health conditions
• Improve prenatal care
• Reduce overdose risk
• Support medication-assisted treatment
• Lower pregnancy complications
• Improve newborn health
• Connect mothers with treatment

How Addiction Treatment Improves Pregnancy Outcomes

Addiction treatment helps pregnant women reduce substance use while improving their physical and mental health. Treatment may include medication-assisted treatment, counseling, prenatal care, mental health therapy, case management, and relapse prevention planning.

Receiving treatment during pregnancy lowers the risk of overdose, improves prenatal care attendance, and supports healthier birth outcomes for both mother and baby.

Relapse Prevention After Childbirth

The weeks after childbirth are a high-risk time for relapse because of stress, hormonal changes, sleep deprivation, and postpartum mental health symptoms. Ongoing treatment, peer support, family involvement, and regular therapy help reduce relapse risk. A postpartum recovery plan should include addiction treatment, mental health care, medication management when appropriate, and regular follow-up with healthcare providers.

Breastfeeding, Family Education, and Newborn Safety

Breastfeeding may help some babies with Neonatal Abstinence Syndrome when a healthcare provider says it is safe. Small amounts of opioids can be present in breast milk, but breastfeeding may still help comfort some infants. It may support bonding, comfort, feeding, and withdrawal symptom control, but providers must review current substance use, medications, infections, and maternal health first.

Family education helps caregivers understand withdrawal symptoms, feeding needs, safe sleep, soothing techniques, and warning signs, including watching feeding tolerance and severe vomiting. A safer home plan can also support infant care and maternal recovery.

Can Neonatal Abstinence Syndrome Be Prevented?

Many cases of Neonatal Abstinence Syndrome can be reduced through early prenatal care, substance use treatment, and medication-assisted treatment when medically appropriate. Pregnant women should never stop opioids suddenly without medical supervision because withdrawal can be dangerous.

Seeking treatment before or during pregnancy can improve health outcomes for both mother and baby and lower the risk of newborn withdrawal.

When to Seek Help

Pregnant women should seek help if they use opioids, fentanyl, heroin, alcohol, methamphetamine, cocaine, benzodiazepines, or other substances. Newborns need urgent medical care for shaking, poor feeding, fever, breathing problems, seizures, or nonstop crying.

Neonatal Abstinence Syndrome Treatment Options

• Medical Monitoring – Tracks withdrawal symptoms, feeding, weight, breathing, and sleep.
• Eat, Sleep, Console Care – Focuses on feeding, sleeping, and soothing before medication is used.
• Comfort Measures – Uses swaddling, skin-to-skin care, low light, and gentle rocking.
• Feeding Support – Helps babies gain weight through frequent or higher-calorie feedings.
• Medication Therapy – Uses morphine, methadone, or buprenorphine for severe symptoms.
• Rooming-In – Keeps mother and baby together when medically safe.
• Lactation Support – Guides breastfeeding when approved by the care team.
• Maternal Addiction Treatment – Supports recovery through residential, outpatient, therapy, or medication-assisted care.
• Mental Health Treatment – Treats depression, anxiety, PTSD, bipolar disorder, and trauma.
• Pediatric Follow-Up – Monitors growth, development, feeding, vision, hearing, and behavior.

For treatment, buprenorphine may lead to shorter hospital stays than morphine, phenobarbital may be used as a second-line medication for severe NAS, and breastfeeding is encouraged unless maternal substance use makes it unsafe.

Does Insurance Cover Treatment?

Many private insurance plans, Medicaid, and government-funded programs cover medically necessary care for Neonatal Abstinence Syndrome. Coverage may include newborn hospitalization, medication, physician care, follow-up visits, addiction treatment, prenatal care, and mental health services.

Conclusion

Neonatal Abstinence Syndrome can affect infants born after prenatal exposure to opioid drugs, other opioids, or certain substances, but early recognition and proper care can improve outcomes. Understanding withdrawal signs, the NAS scoring system, planning treatment, and the factors that influence recovery helps families make informed decisions. If substance misuse or maternal opioid use is a concern during pregnancy, seeking medical care as early as possible can reduce possible complications and support healthier outcomes for both mother and baby.