Editor's Note: Scientific literature generally uses the words "mother" and "maternal" in reference to a person with a uterus who has carried a child. To avoid inconsistencies, this article also uses ...

Breast milk contains living bacteria that transfer to babies' guts, helping build healthy digestion and immune systems.

Baby poop can vary greatly. However, a milk allergy or lactose intolerance may cause poop to be more watery and frequent than usual. Cow’s milk allergy is one of the most common food allergies in ...