It is normal for babies to have no bowel movement for three days but have smelly farts if they are breastfed and in good general condition. Babies more than three days without defecation but have smelly farts may be constipation, according to the cause is divided into functional constipation and organic constipation, which is not normal, need to be given according to the cause of the baby’s symptomatic treatment. 1. Normal situation: if the baby is breastfed, three days without stool with smelly farts, but no vomiting, abdominal distension, no reduction in breastfeeding. If the stool is paste-like after discharge, it can be regarded as normal. 2. Functional constipation: for example, constipation due to gastrointestinal dysfunction caused by improper diet, dehydration and other factors, you can adjust the diet, drink more water, eat more food rich in dietary fiber, and follow the doctor’s instructions, such as compound pepsin powder and other oral digestive aids to promote gastrointestinal peristalsis and improve the symptoms of constipation. 3. Organic constipation: such as congenital megacolon, intestinal stenosis, incomplete intestinal obstruction and other diseases, the baby defecation difficulties, mostly accompanied by abdominal distension, there can be exhaust phenomenon, the need to go to the hospital in a timely manner, according to the condition of the treatment given to the symptoms. It is recommended that babies who do not have bowel movements for three days go to the hospital in time to avoid adverse consequences.