It’s 2 am. Your baby has just vomited — maybe once, maybe several times. You’re wondering if this is serious or if you can go back to sleep. Here is a clear guide to make that call.
First: Spit-Up vs. Vomiting
These are different things:
| Spit-Up | Vomiting | |
|---|---|---|
| Force | Effortless flow | Forceful, projectile |
| Amount | Small (looks like a lot, usually isn’t) | Large, may include bile |
| Baby’s state | Unaware, happy | Distressed, may cry |
| Age | Very common under 6 months | Any age |
Spit-up is normal in babies under 6 months and does not need any intervention. If your baby spits up milk, burps, and goes back to sleep happily — that is not what this article is about.
Go to the ER Now
Do not wait until morning if any of the following are present:
- Vomit is green or yellow — green vomit (bile) can mean intestinal obstruction. This is a surgical emergency.
- Vomit contains blood — red or brown coffee-ground appearance needs immediate evaluation.
- Projectile vomiting repeatedly in a baby under 3 months — possible pyloric stenosis (especially in male babies, 3–8 weeks old, who vomit after every feed and are hungry again immediately)
- Signs of dehydration: no wet diaper in 6+ hours, dry mouth, no tears when crying, sunken fontanelle (soft spot), very lethargic or limp
- Severe abdominal pain — baby is inconsolable, drawing legs up, screaming
- High fever — in a baby under 3 months, a temperature of 38°C (100.4°F) or higher is itself a medical emergency, with or without vomiting — go in. Measure rectally for accuracy in small infants. In older babies, a fever of 39°C+ along with vomiting needs same-night review.
- Head injury — vomiting after a fall or head knock needs evaluation for concussion
- Baby is under 1 month old — any vomiting (not spit-up) in a newborn needs same-night evaluation. In a newborn, also treat refusing all feeds, unusual lethargy or floppiness, fast or laboured breathing, or a fever or an unusually low temperature as danger signs in their own right.
- Cannot keep anything down for 8 hours — or, in a small infant, cannot keep down even small sips
- Signs of dehydration are already present (see below) — in a small baby these warrant going in now, not waiting to see if it improves; small infants can decompensate quickly.
When in doubt, get the baby seen. It is always okay to call your paediatrician or go in. With a small baby, trust your instinct — no one will fault you for bringing in a baby who turns out to be fine.
Call Your Paediatrician in the Morning (or Within Hours)
These do not need the ER tonight but should not wait days:
- Vomiting 3+ times in one night with no other alarming signs
- Vomiting with diarrhoea (likely gastroenteritis, but dehydration risk needs monitoring)
- Baby is unusually sleepy or not feeding well after vomiting
- Vomiting that started after introducing a new food (possible allergy or intolerance)
Common Causes of Nighttime Vomiting
Gastroenteritis (Stomach Bug)
The most common cause. Viral (rotavirus, norovirus) or bacterial. Usually accompanied by diarrhoea. Contagious. The main risk is dehydration — not the vomiting itself.
Overfeeding / Fast Let-Down
A baby who took too much milk too quickly may vomit, especially lying flat. This is harmless but worth adjusting feeding technique.
GERD (Acid Reflux)
Babies with reflux often vomit more at night (lying flat worsens it). It usually improves by 12 months as the baby sits up and takes solids. Associated with arching, irritability during feeds, poor sleep. If reflux comes with poor weight gain, feed refusal, or distress, have it reviewed — it may not be simple reflux.
Gagging on Mucus (Post-Nasal Drip)
When a baby is congested, mucus can collect at the back of the throat and make the baby gag and bring up some milk and mucus — especially at night when the head is flat. This is usually minor and goes with a cold. But do not write off vomiting that is forceful, repeated, or comes with any red-flag sign as “just a cold” — that still needs to be checked.
Food Poisoning
Sudden vomiting 1–8 hours after eating, especially if older child or other family members are also sick.
Pyloric Stenosis
Rare but important. Typically first-born boys, 3–8 weeks old, who projectile-vomit (non-bilious, no green) after every feed and seem hungry again straight away. Needs an ultrasound and surgery. Do not wait — this causes severe dehydration quickly.
What to Do Right Now (If Not Going to ER)
Step 1: Stay calm. Panic transfers to your baby.
Step 2: Position. Hold baby upright for 20–30 minutes after vomiting. Do not lay flat immediately.
Step 3: Wait before feeding. For infants: wait 15–20 minutes, then offer small amounts of breast milk or formula. For older babies: offer small sips of ORS (a low-osmolarity oral rehydration solution such as Electral, Enerzal, Prolyte, or any pharmacy WHO-ORS / ORS-L sachet) — not water, not juice.
Step 4: Small, frequent feeds. Do not try to give a full feed after vomiting — the stomach will reject it. Small amounts every 15–20 minutes.
Step 5: Track wet diapers. This is your dehydration monitor. Keep a mental count.
Step 6: Do not give anti-emetics. Vomiting medicines like domperidone or promethazine are sold over the counter and over-used for infant vomiting in India — do not give them to a baby or young child without a doctor seeing them first. These can have serious side effects.
Oral Rehydration: The Key Priority
The danger in vomiting is fluid loss, not the vomiting itself. If your baby is vomiting and cannot keep feeds down:
- Under 6 months: Continue breast milk — it is the best ORS for infants. Offer smaller, more frequent feeds. Do not stop breastfeeding to give ORS; breast milk stays the priority. (Formula-fed babies: continue formula.)
- Over 6 months: Low-osmolarity WHO-ORS / ORS-L sachets — in India, Electral, Enerzal, Prolyte, or any pharmacy sachet marked low-osmolarity / WHO-ORS. Dissolve one full sachet in exactly 1 litre of clean (boiled-and-cooled) water — never make it stronger, never weaker, and never add extra sugar or salt by hand. Start with 5 ml (one teaspoon) every 5 minutes and increase the amount gradually as the baby tolerates it. Replace ongoing losses — roughly an extra 10 ml per kg after each loose stool. If the baby cannot keep down even small sips, that itself is a reason to seek care.
- Avoid: Plain water alone (lacks electrolytes), sports drinks, fruit juice, fizzy drinks.
(NRI / overseas readers: Pedialyte or Enfalyte are equivalent ready-made options where sold.)
How Long Is Too Long?
- Vomiting that resolves within 24 hours with improving hydration: gastroenteritis, watch at home.
- Vomiting beyond 24–48 hours without improvement: call your paediatrician.
- Any point where you cannot maintain hydration or baby seems limp/very unwell: ER.
FAQ
Q: My baby vomited once and went back to sleep. Do I need to do anything?
If the baby is now sleeping normally, has had wet diapers recently, and showed no alarming signs — monitor. One episode of vomiting in an otherwise well baby is not an emergency. Check on them in 2 hours.
Q: Should I wake my baby to check on them after vomiting?
If the baby went back to sleep and you have no major concerns, you do not need to wake them. Check their breathing is normal, they are sleeping in a safe position (on back), and there is no vomit near the face.
Q: Is it safe to breastfeed immediately after vomiting?
Wait 15–20 minutes, then try a smaller feed than usual. Breast milk is gentle and acts as both food and hydration. If the baby vomits again immediately, wait longer and offer even smaller amounts.
Q: Green vomit — is that always an emergency?
Yes. Green vomit indicates bile, which is produced below the stomach. This means something is blocking the passage of food past the first part of the small intestine. Go to the ER immediately regardless of how otherwise well the baby seems.
Q: My 2-month-old projectile-vomits after every feed. Is this reflux?
Reflux vomiting is usually not projectile. True projectile vomiting (shoots across the room) in a baby under 3 months, after every feed, with baby always seeming hungry again — is classic pyloric stenosis until proven otherwise. This needs an ultrasound today.
This article is general information for Indian parents, not a substitute for examination by your pediatrician. In an emergency, call 112 or 108.