Vomit vs. Spit Up: How to Tell the Difference & When to Call the Doctor
Vomit is forceful stomach contents expelled through the mouth; spit up is gentle, small-volume milk that dribbles from a baby’s mouth when the stomach valve is still immature.
Parents panic because both involve liquid leaving tiny mouths. Night feeds blur together, laundry piles up, and Google images look identical at 3 a.m.—so every burp becomes “vomit” in exhausted minds.
Key Differences
Vomit: projectile, sour odor, may contain bile or chunks, upsets baby. Spit up: effortless, milky scent, no distress, baby still hungry and happy.
Which One Should You Choose?
Spit up needs a burp cloth. Vomit needs a doctor if it’s green, bloody, causes dehydration, or comes after a head injury.
How much spit up is too much?
If weight gain slows or diapers dry out, call your pediatrician.
Can spit up become vomit?
Yes, when volume increases and baby shows distress, spit up has crossed the line.