Newborn · NAS
Neonatal Abstinence Syndrome (NAS)
Newborn withdrawal from substances used in pregnancy. Finnegan score (21 items, ≥8 triggers treatment). Non-pharmacological first (quiet, swaddling, breastfeeding); morphine if needed. ESC newer approach. UK NICE / RCPCH.
Last reviewed 2 June 2026
Finnegan / NAS score
Neonatal abstinence (withdrawal) severity
Score items present in the past 3-4 hours.
Educational tool only — not medical advice. AAP 2023 NOWS CPG endorses the Finnegan / modified Finnegan. The Eat Sleep Console (ESC) approach (NEJM 2023 trial) is an alternative that reduces pharmacotherapy days and length of stay — increasingly adopted. Mothers on opioid-use disorder treatment (methadone, buprenorphine) are encouraged to breastfeed unless other contraindications.
What does this mean?
Neonatal opioid withdrawal syndrome (NOWS, formerly NAS) is rising with the opioid epidemic — affecting roughly 7 per 1,000 US births. Withdrawal typically begins 24–72 h after birth for opioids, longer for methadone. Finnegan scoring guides care: non-pharmacological first — rooming-in, skin-to-skin, on-demand breastfeeding (yes, mothers on methadone or buprenorphine SHOULD breastfeed, AAP 2023), low-light low-noise environment, gentle handling. Pharmacotherapy (morphine, methadone, or buprenorphine) for persistently elevated scores. The Eat-Sleep-Console (ESC) functional approach (NEJM 2023) shifted the focus from numeric thresholds to function (is the baby eating ≥ 1 oz/feed, sleeping ≥ 1 h, consolable < 10 min?) and has cut pharmacotherapy days ~50 % and length of stay ~6 days. Long-term outcomes depend more on maternal/family stability than the withdrawal itself.
What is NAS?
Neonatal Abstinence Syndrome — withdrawal symptoms in newborn from substances used in pregnancy.
Most common cause: opioids (prescription, methadone, heroin, buprenorphine). Also: SSRIs, benzodiazepines, alcohol (FAS), nicotine, cannabis, cocaine.
Finnegan score
21 items across 3 categories:
- Neurological/CNS: high-pitched cry, tremors, increased tone, sleep disturbance, sneezing, yawning.
- Metabolic/vasomotor/respiratory: sweating, fever, fast breathing, mottling, nasal congestion.
- Gastrointestinal: excessive suck, poor feeding, regurgitation, loose stools.
Each item scored 0-5. Score ≥8 three times consecutively (or ≥12 once) usually triggers pharmacological treatment.
Symptom timing by substance
- Heroin: within 24h.
- Prescription opioids: 24-72h.
- Methadone: 24-72h; can delay to 5-7 days.
- Buprenorphine: 36-72h; usually milder.
- Alcohol: hours-days.
- SSRIs: hours; usually mild self-limiting.
- Benzodiazepines: 24h-7 days.
Monitor 5-7 days minimum; longer for methadone.
Treatment
- Non-pharmacological first: quiet, dim environment; swaddling; minimal handling; skin-to-skin; rooming-in; breastfeeding.
- Pharmacological: morphine first-line for opioid NAS; weaned over days-weeks.
- Second-line: phenobarbital, clonidine for non-opioid / refractory.
- Nutrition: small frequent feeds.
Breastfeeding with methadone / buprenorphine
Usually encouraged. Tiny amounts in milk; reduces NAS severity + hospital stay. Stops if: active street opioid use, HIV positive (UK), severe maternal illness.
Eat Sleep Console (ESC)
Newer approach. Assesses function: can baby EAT (1+ oz/feed), SLEEP (1+ hour), CONSOLE (within 10 min)? If yes across all three: no pharmacological needed.
Reduces hospital stay + medication exposure. Equally safe. AAP-supported alternative.
Long-term outlook
Most babies recover within weeks-months. Subtle differences in behaviour, attention, sleep, cognition possible — confounded by social factors. Early intervention key.
FAS (fetal alcohol syndrome)
Different from opioid NAS. Specific facial features, growth deficiency, CNS abnormalities. Lifelong condition. No safe alcohol level. NOFAS UK, FASD Support Network.
Different scenarios
Scenario 1: Mother on methadone maintenance, baby born to term
Specialist NAS team prepared. Rooming-in encouraged. Breastfeeding supported. Monitor 5-7 days minimum. Morphine if Finnegan ≥8.
Scenario 2: Baby born to SSRI-treated mum, mildly irritable
Mild self-limiting. Continue breastfeeding. Comfort measures. Usually resolves 1-2 weeks.
Scenario 3: Severe NAS, ESC approach
Assess EAT/SLEEP/CONSOLE every feed. If not meeting criteria, escalate care; pharmacological if needed.
Scenario 4: Maternal alcohol use disclosed late
Assess for FAS features. Long-term developmental follow-up regardless of acute symptoms.
Scenario 5: Multiple substances, complex social situation
Multi-agency: addiction, social work, neonatology, mental health. Safety + support plan. Possible CP plan.
Care guidance — NAS
- Non-pharm first; pharm if needed.
- Breastfeeding usually supported with maintenance treatment.
- ESC alternative reduces overtreatment.
- Specialist NAS team.
- Multi-agency support.
- Long-term developmental follow-up.
- NO judgment; focus on welfare.
- Recovery is possible.
Sources
- Finnegan LP, et al. Neonatal abstinence syndrome: assessment and management. Addict Dis 1975.
- NICE NG54. Drug misuse in over 16s.
- RCPCH. Neonatal abstinence syndrome guidance.
- AAP. Eat, Sleep, Console: alternative approach.
Frequently asked questions
What is NAS?
NEONATAL ABSTINENCE SYNDROME — withdrawal symptoms in newborn baby from substances used in pregnancy. MOST COMMON cause: OPIOIDS (prescription painkillers, methadone, heroin, buprenorphine). ALSO: SSRIs, benzodiazepines, alcohol (FAS — fetal alcohol syndrome — different presentation), nicotine, cannabis, cocaine. SYMPTOMS USUALLY 24-72 hours after birth; some delayed (methadone — can be 5-7 days). MANAGEABLE with appropriate care; many babies recover fully.
What's the Finnegan score?
MOST WIDELY USED scoring system for opioid-related NAS. 21 ITEMS across 3 categories: (1) NEUROLOGICAL/CNS — high-pitched cry, sleep disturbance, tremors, increased tone, sneezing, yawning; (2) METABOLIC/VASOMOTOR/RESPIRATORY — sweating, fever, fast breathing, mottling, nasal congestion; (3) GASTROINTESTINAL — excessive suck, poor feeding, regurgitation, loose stools. EACH item scored 0-5 depending on severity. TOTAL up to ~40. SCORED every 3-4 hours by trained staff. SCORE ≥8 usually triggers pharmacological treatment.
What are NAS symptoms?
BABY MAY HAVE: (1) HIGH-PITCHED, inconsolable cry; (2) TREMORS / shaking; (3) INCREASED muscle tone (stiff); (4) JITTERY; (5) DIFFICULT to settle / sleep; (6) POOR FEEDING (sucking excessive but feeding poor); (7) FREQUENT yawning, sneezing; (8) DIARRHOEA; (9) VOMITING / regurgitation; (10) SWEATING; (11) FEVER / temperature instability; (12) FAST BREATHING; (13) MOTTLED skin; (14) SEIZURES (severe — rare). SYMPTOMS VARY by substance + duration of exposure + maternal dose.
When does NAS appear?
TIMING by substance: (1) HEROIN — within 24 hours; (2) PRESCRIPTION OPIOIDS — 24-72 hours; (3) METHADONE — 24-72 hours but CAN BE DELAYED to 5-7 days (long half-life); (4) BUPRENORPHINE — 36-72 hours; usually milder; (5) ALCOHOL — within hours to days; (6) SSRIs — within hours; usually mild + self-limiting; (7) BENZODIAZEPINES — within 24h-7 days. MONITORING period AT LEAST 5-7 DAYS depending on substance; longer for methadone.
How is NAS treated?
STEPWISE: (1) NON-PHARMACOLOGICAL FIRST — quiet, dim environment; swaddling; minimal handling; skin-to-skin; rooming-in with mother; BREASTFEEDING (encouraged in most cases — see below). (2) PHARMACOLOGICAL — if Finnegan ≥8 three times consecutively (or ≥12 once): MORPHINE first-line for opioid NAS; weaned gradually over days-weeks. SECOND-LINE: phenobarbital, clonidine for non-opioid or refractory cases. (3) NUTRITION — small frequent feeds. (4) MONITORING for complications.
Should I breastfeed if I'm on substitutes (methadone, buprenorphine)?
YES — usually encouraged. Methadone + buprenorphine pass into milk in tiny amounts; do NOT cause withdrawal (paradoxically — small dose maintains the level). BREASTFEEDING actually REDUCES NAS severity + length of hospital stay. BENEFITS for mother-baby bonding. STOP if: active street opioid / cocaine use (not in maintenance); HIV positive (in UK); maternal severe illness. CONFIRMATION with addiction medicine specialist + neonatal team.
What about breastfeeding with SSRIs?
USUALLY YES. Most SSRIs minimal milk transfer. SERTRALINE first-line (lowest). FLUOXETINE longer half-life but generally OK. PAROXETINE OK. CONTINUED MATERNAL TREATMENT often better than withdrawal — mum's mental health crucial. BABY: monitor for sedation, poor feeding, irritability; symptoms usually mild + self-limiting; rarely needs intervention.
What about opioids in pregnancy treatment?
OPIOID DEPENDENCY in pregnancy — best practice: stable maintenance (METHADONE or BUPRENORPHINE) supervised by addiction services. AVOID 'cold turkey' withdrawal — can cause fetal distress + miscarriage. PREGNANCY-SPECIFIC ADDICTION SERVICES (UK: NHS specialist clinics + community drug services). MULTIDISCIPLINARY care — obstetric, addiction, social work, mental health. SHARED CARE planning before birth + NAS team prepared.
Will my baby go to NICU?
DEPENDS on severity. MILD NAS (Finnegan <8 consistently): mother-baby unit OR postnatal ward with monitoring; rooming-in. MODERATE (intermittent ≥8 but no pharmacological needed): closer monitoring; some go to special care. SEVERE / on pharmacological treatment: NICU usually. STAY: 5-21 days typical for treated NAS; longer if severe / methadone. AIM: maximum rooming-in with mum + family involvement.
What's 'eat sleep console' (ESC) approach?
NEWER MANAGEMENT approach (versus traditional Finnegan-based). Assesses baby's FUNCTION: can baby EAT (1+ oz/feed), SLEEP (1+ hour), CONSOLE (within 10 min)? IF YES across all three: NO pharmacological treatment. IF NO: address with non-pharm first; medication if persists. EVIDENCE: reduces hospital stay + medication exposure; equally safe. AAP supports as alternative. NOT all UK NHS use yet — protocols varying.
What's the long-term outlook?
MOST BABIES recover from acute NAS within weeks to months. LONG-TERM: studies suggest most NAS babies develop normally; some research suggests subtle differences in: behaviour, attention, sleep, cognition. CONFOUNDED by social factors (maternal substance use often co-exists with poverty, instability). EARLY intervention important — parenting support, developmental tracking, early learning. ANNUAL paediatric follow-up.
What about FAS (fetal alcohol syndrome)?
DIFFERENT presentation. FAS: SPECIFIC FACIAL features (smooth philtrum, thin upper lip, short palpebral fissures); growth deficiency; CNS abnormalities (learning, behaviour). LIFELONG CONDITION (not just withdrawal). EXPOSURE level matters; no SAFE level of alcohol in pregnancy. SIBLINGS at risk if continued. DIAGNOSIS: clinical + history; FASD (Fetal Alcohol Spectrum Disorder) wider term. SPECIAL EDUCATION needs common. SUPPORT: NOFAS UK, FASD Support Network.
What support is available?
(1) NEONATAL TEAM + NICU SPECIALISTS in NAS; (2) ADDICTION specialists for mother — continuity of care; (3) SOCIAL WORK involvement standard; sometimes child protection assessment; (4) HEALTH VISITORS — extra support; (5) PARENTING courses; (6) ADOPTION support if removed from biological parents; (7) PEER SUPPORT — addiction recovery groups; (8) MENTAL HEALTH — perinatal mental health team if depression/anxiety; (9) CHARITIES — Adfam, We Are With You (Action on Addiction). NO JUDGMENT — focus on baby + family welfare.
Could social services be involved?
OFTEN YES initially — to ensure safety + plan support. NOT automatically removal. ASSESSMENT considers: (1) Maternal engagement with treatment; (2) Stable support / housing; (3) Partner / family support; (4) Safe care environment. MULTI-AGENCY plan. MAJORITY stay with biological family. EARLY engagement with services + honesty about needs key. CHILD'S WELFARE paramount but families supported.
Can I prevent NAS?
BEST: stable substance treatment BEFORE pregnancy or as early as possible. METHADONE / BUPRENORPHINE maintenance reduces NAS severity vs uncontrolled use. PRENATAL CARE: drug team + obstetric + mental health; addressing housing, income, mental health. AVOID benzodiazepines if possible. SMOKING cessation. ALCOHOL avoidance. PREGNANCY-SPECIFIC ADDICTION SERVICES important. NOT YOUR FAULT alone — addiction is illness; recovery possible.
How does this relate to other calculators on BumpBites?
Companion: /calculators/esc-nows alternative approach; /calculators/nips-pain; /calculators/apgar-score; /calculators/eos-sepsis; /calculators/breastfeeding-latch; /calculators/phq9-perinatal; /calculators/gad7-perinatal (mental health overlap).