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Vomiting in a newborn (green vomit is an emergency)

Also called: Vomiting in a newborn, green vomit, bilious vomiting, projectile vomiting

Spitting up is normal, but green (bile-colored) vomit in a baby is an emergency because it can mean a twisted or blocked bowel. Forceful vomiting after feeds needs a same-day check.

Green vomitEmergency
Projectile vomitingSame-day check (pyloric stenosis)
NormalSmall spit-ups

Overview

Pyloric stenosis usually starts at 2 to 8 weeks with forceful vomiting after every feed and a hungry baby.

Symptoms

Common signs:

  • Vomiting in a newborn

Less common

  • Green vomit
  • Forceful vomiting
  • Fewer wet diapers
  • Hungry right after vomiting

Look up a symptom: Vomiting

When to get medical care

Call 911Green vomit, a swollen belly, or a limp baby: call 911.
Get care todayForceful vomiting or fewer wet diapers.
See a doctor soonFrequent vomiting.

Causes

Bowel blockage, pyloric stenosis, reflux.

Does it spread or run in families?

  • It isn't contagious. You can't catch it from someone else.

Possible complications

Diagnosis

Imaging finds the cause.

The exam

Belly exam.

Tests

Tests, if needed:

  • X-ray or ultrasound:

Treatment

Get help.

Self-care

  • Note the color and how often
  • Keep feeding unless told to stop
  • Count wet diapers
  • Hold baby upright after feeds

Prevention

To lower your risk or prevent problems:

  • There is no known way to prevent it. Early checkups help find it sooner.

Which doctor treats this

  • Emergency doctors treat it first, in the ER.

Back to school, work, or sports

  • Recovery time varies. Ask your care team when you can drive, lift, work, and exercise.

Children, pregnancy, and older adults

  • Babies 2 to 8 weeks: Watch for forceful vomiting (pyloric stenosis).

For caregivers

  • Learn the warning signs and when to call the doctor or 911.
  • Keep a list of your child's medicines, doses, and doctors on your phone.
  • Tell teachers, coaches, and sitters what to watch for and what to do.
  • Learn CPR. Many hospitals and the Red Cross offer classes.
  • Take breaks and ask for help. Caregivers need care too.

Outlook

Treatable.

Pyloric stenosis is cured with a small surgery.

Getting ready for your visit

Bring a list of your symptoms and medicines.

Questions to ask

  • Is this reflux or something more?

Research studies

Research studies test new ways to find and treat health problems. Some are looking for volunteers. Talk with your doctor before joining one.

Search ClinicalTrials.gov for studies on Vomiting in a newborn (green vomit is an emergency)

Sources

Last updated 2026-11-12.