Newborns pooping on breastfeeding may be a normal physiological phenomenon, or it may be due to other reasons, such as cold stomach, poor diet or gastrointestinal dysfunction. 1. Physiological reasons: newborns may poop as soon as they are fed because the gastrointestinal function is not fully developed and the intestinal peristalsis increases as soon as they are fed. 2. Other reasons: the number of stools may increase when the abdomen is cold; the quality of breastmilk is not good, or the temperature of formula feeding is too low, etc. will stimulate the baby’s intestines and stomach, resulting in pooping on breastfeeding; or there may be indigestion, bacterial or viral infections resulting in gastrointestinal dysfunction. There may be other reasons why a newborn baby poops after breastfeeding, so it is recommended that you go to the hospital in time for a complete examination to determine the cause of the problem, and then give targeted treatment under the guidance of the doctor.