How often should a breastfed baby poop? Learn about constipation in breastfed babies including why it happens and how to treat it. Medically reviewed by Teja Dyamenahalli, MD, MPH, FAAP Medically ...

In the first week of life, a baby's stool changes from meconium to transitional stool, which is dark green to brown. Towards the end of the week, breastfed babies typically pass mustard-yellow ...

But there's a downside. Formula remains in the baby's system longer, so it begins to ferment, she says. This results in what she calls "ultra-stinky poop!" Breastfed babies typically start ...