It is usually not normal for an infant not to poop for a week. It may be due to functional constipation, or it may be caused by organic diseases. Infants tend to defecate more often, may be 1~3 times a day, occasionally 2~3 days defecation phenomenon, if a week is not normal, belongs to the performance of constipation, may be functional constipation, may also be due to organic diseases. Functional constipation is mostly due to the baby’s gastrointestinal function is relatively weak, if the diet is unreasonable, for example, to the baby too much to add protein supplements, while the crude fiber intake is small, less water intake, this situation will occur. Parents need to adjust the complementary food, which can improve the condition. Organic constipation is more common in congenital megacolon, intestinal obstruction, etc. However, congenital megacolon usually has delayed expulsion of fetal stool after birth. It is necessary to consult a doctor in time to clarify the cause of the disease and give symptomatic treatment. If the baby does not poop for a week, it is recommended to go to the hospital in time to find out the cause of the problem, to avoid delaying the treatment.