Normal vs Abnormal Newborn Poop: Color and Consistency Guide
Normal newborn stool color changes dramatically in the first few days. Knowing what to expect prevents unnecessary alarm.
Meconium (days 1 to 2): Thick, sticky, and almost black or dark green. This is made up of everything your baby ingested in the womb. It should clear within 48 hours of birth.
Transitional stool (days 3 to 5): Shifts from green-black to yellow-green as breast milk or formula comes in. Looser in texture than meconium.
Established breastfed stool: Mustard yellow, soft, often seedy or grainy, with a faintly sweet smell. This is textbook normal.
Formula-fed stool: Tan to yellow-brown, firmer, and with a stronger odor.
Green poop is common and usually harmless. It can happen when a breastfed baby gets more foremilk than hindmilk, during a growth spurt, or during a minor digestive adjustment. Occasional green stools rarely need a doctor's visit.
Stool colors that need prompt attention:
- Bright red blood in the stool or on the diaper
- Black tarry stool after the first few days (different from meconium)
- Pale white, grey, or chalky stool, which can point to a liver concern
- Mucus mixed into stool consistently over several days