Newborn baby poop red, may be related to milk protein allergy, may also be due to intussusception, intestinal infection and other reasons. 1. Milk protein allergy: Especially children who are allergic themselves are prone to milk protein allergy, leading to frequent diarrhea, which is likely to cause damage to the intestinal mucosa, which may result in blood in the stool, thus causing red poop. 2. Intussusception: this disease usually refers to a section of the intestinal tube into the adjacent intestinal lumen, easy to cause intestinal obstruction, which may cause intestinal mucosal damage, and may cause blood in the stool. If the newborn suffers from intussusception, it may show the phenomenon of red poop, and may also be accompanied by abdominal pain, vomiting and other manifestations. 3. Intestinal infections: bacterial enteritis, typhoid fever, dysentery, etc., the presence of intestinal infections, which may cause gastrointestinal bleeding, resulting in newborns show symptoms of red poop, may also be accompanied by abdominal pain, diarrhea and other manifestations. Red poop in newborns can also be caused by other reasons, if accompanied by obvious symptoms, it is recommended to consult a doctor as soon as possible to diagnose the cause, and then give targeted treatment.