The infant period is from birth to 1 year old, and the newborn period is from the delivery of the fetus to 28 days, and this period is included in the infant period. If a newborn baby does not have a bowel movement for a day, the first thing to do is to exclude the reason for not eating enough. When the baby eats less milk or supplements, he or she will not have a bowel movement because of insufficient milk intake to form a stool mass. Babies do not relieve stool a day, there will be a phenomenon called “save belly”, whether breast-fed or artificially fed babies grow after a period of time, stool here began to change 1-2 times a day, or 2 days a time, we commonly known as “save belly”. Infant baby’s digestive system is not well developed, occasionally abnormal stool, 1 day no stool, do not be too anxious, you can give the baby appropriate more water, pay attention to the baby eating enough, if the baby is not uncomfortable such as vomiting bloating performance, the next day on the stool and stool properties are the same as usual, not dry, is a normal phenomenon. If the baby has not relieved the stool for several days, or if the baby has obvious abdominal distension, vomiting, abdominal masses, etc., you need to take the baby to the hospital for a checkup and give treatment under the guidance of the doctor.