There are many causes of diarrhea in newborns, and some of them can be cured by themselves, while some of them need to be treated. Newborns who are breastfed can defecate several times a day and have loose stools. If they are in good spirits and have normal feeding status and weight gain, they mostly have physiological diarrhea, and their stools can gradually turn normal after the addition of complementary foods. In addition, dyspepsia and food accumulation can cause diarrhea in newborns, mostly due to the imperfect development of the digestive system and nervous system of newborns, which usually does not affect their normal diet and mental state, and usually gradually improve within a week. If a newborn develops infectious diarrhea, he or she should promptly consult a pediatrician and undergo medication under the guidance of a doctor. Pay attention to the fact that newborns should eat less and eat more, can be divided into several nursing sessions, indoor temperature and humidity is appropriate, increase and decrease clothing at the right time to avoid heat or cold.