PhysiologyReading time: 3 minutes

Why Does My Baby Spit Up and How to Help

CategoryPhysiology
Why Does My Baby Spit Up and How to Help

Medically reviewed by pediatrician and perinatal psychologist Polina Kizino

Spitting up is normal for babies under 1 year old. It’s usually caused by an immature digestive system and goes away on its own. If the amount is small and your baby is active and gaining weight — there’s no need to worry. But if there’s vomiting, fever, lethargy, or refusal to eat — see a doctor.

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Quick takeaways

  • Spitting up during the first year is normal. It's due to an immature digestive system. By 6–12 months, it usually stops on its own.
  • Safe spit-up: small amount (1–2 tablespoons), no blood or mucus, doesn’t affect appetite or weight.
  • Worrying signs: green or yellow vomiting, blood or mucus, fever, lethargy. If your baby isn’t gaining weight or refuses to eat — see a doctor.
  • How to help: feed smaller amounts more often, hold upright after feeds, avoid active play post-meal.

After feeding, babies may spit up small amounts of milk

It’s a common situation most parents face. Main reasons around 1–2 months:

  • Immature lower esophageal sphincter: this muscle isn’t strong enough to keep food down
  • Lying flat: babies are mostly in a horizontal position, which encourages spit-up
  • Feeding factors: fast sucking, swallowing air, or overeating
  • Tiny stomach size: newborn stomachs are as small as a walnut
  • Frequent feeding: food may not digest before the next feed

Spitting up usually resolves by 6–12 months as babies spend more time upright and their digestion matures.

To reduce frequency and volume of spit-up, follow simple rules

  • Feed smaller amounts more often
  • Space feeds out so digestion can happen
  • Watch for fullness cues — baby turns away, slows down, relaxes hands
  • Take breaks every 5–10 minutes and at the end
  • Wait 20–30 minutes before active play
  • Avoid tight clothing around the tummy

If baby spits up often, adjust your feeding technique

For breastfeeding

  • Ensure a deep latch with a wide mouth
  • Hold the baby semi-upright and support the head/neck
  • If you have strong letdown, express some milk before feeding

For formula feeding

  • Use an age-appropriate, anti-colic nipple
  • Hold bottle so nipple is always filled with milk
  • Don’t force baby to finish the bottle
  • Keep 3-hour intervals between formula feeds

Helpful positions to prevent spit-up

  • Upright ("burping" position): hold baby on your shoulder for 15–20 minutes after feeding
  • Left side lying (supervised): helps empty the stomach
  • Elevated crib head: raise crib head 15–30° (for awake time only)

When to consult a pediatrician

Normal spit-up

  • Volume: 1 tsp to 1 tbsp
  • Looks like undigested or curdled milk
  • Baby is content and gaining weight
  • Frequency decreases with age

Even 1 tbsp can make a big stain — try pouring it on fabric to see.

Concerning signs

  • Forceful vomiting
  • Green or yellow color
  • Blood or mucus
  • Fever or rash
  • Refuses food, poor weight gain
  • Diarrhea or constipation
  • Baby seems ill, cries often
  • Spit-up worsens over time

Even one of these signs — see your doctor promptly.

FAQs about why babies spit up and how to help

Up to what age is spit-up considered normal?

Spit-up is normal in most infants during the first year of life and is related to an immature digestive system. It usually becomes less frequent as the baby grows and typically disappears by 6–12 months when the child spends more time upright and gains better control over feeding and digestion.

Why does my baby spit up after feeding?

Frequent spit-up is usually caused by an immature digestive system, a weak lower esophageal sphincter, swallowing air during feeding, and overfeeding. Lying flat and very frequent feeds can also contribute. In most cases, this is normal in young infants if the baby is otherwise healthy and gaining weight well.

How can I reduce spit-up in my baby?

To reduce spit-up, offer smaller but more frequent feeds, ensure a proper latch or bottle position, and avoid overfeeding. After feeding, keep the baby upright for 15–20 minutes so air can escape and milk can settle in the stomach. Also avoid active play or sudden movements immediately after feeding.

When should I see a doctor for spit-up?

You should see a doctor if there is forceful or projectile vomiting, green or yellow spit-up, blood or mucus, fever, lethargy, or refusal to eat. Poor weight gain is also a warning sign. Even one of these symptoms requires prompt evaluation by a pediatrician.

With care

Our articles are based on evidence-based medicine and reviewed by pediatricians. However, they do not replace a consultation with your doctor. Every child is unique — if you have any concerns, please consult a medical professional.

  • Antono B, Dotson A. Gastroesophageal Reflux in Infants and Children: Diagnosis and Treatment. Am Fam Physician. 2025 Jan;111(1):62-72. PMID: 39823617. https://pubmed.ncbi.nlm.nih.gov/39823617/. Accessed 15 Apr. 2026.