The brown color of newborn baby’s poop may be due to indigestion, milk protein allergy or gastrointestinal bleeding. 1. indigestion: due to the gastrointestinal tract of the newborn is relatively fragile digestive capacity, if the intestinal flora imbalance, will lead to gastrointestinal tract food can not be completely digested and absorbed, manifested in the newborn’s poop for the brown. 2. Milk protein allergy: milk protein allergy is more common, will be manifested as eczema, accompanied by nausea, vomiting, diarrhea, abdominal distension, will be manifested as newborn baby poop presented as brown. 3. Gastrointestinal bleeding: If there is gastrointestinal bleeding, the newborn’s stool may also appear brown, such as intussusception, intestinal obstruction or acute gastroenteritis. All of these may cause the baby’s stool to be brown If the newborn’s stool is brown, it is recommended to observe closely, consult the doctor for any abnormalities, and follow the doctor’s instructions for symptomatic treatment.