It is not normal for babies to have bowel movements once a week, and it may be due to constipation. If a baby has a bowel movement once a week, he or she may be constipated. Infant constipation is categorized into organic constipation and functional constipation. Organic constipation is constipation caused by systemic or intestinal disorders, such as hypothyroidism, spinal cord embolism, etc. Functional constipation includes genetic, dietary, and metabolic factors. Functional constipation includes those caused by genetic, dietary and metabolic factors. Typical manifestations of constipation in infants are decreased frequency of defecation, prolonged time between defecation, dry stools and difficult to discharge, and in severe cases, it can be complicated by hemorrhoids, anal fissure, rectal prolapse. Some of the patients may have symptoms such as crying and loss of appetite. Doctors will first conduct a physical examination of the child, a preliminary understanding of the child’s condition, and then selectively allow the child to carry out fecal routine, fecal occult blood test, serum hormone tests, combined with clinical symptoms and results of the comprehensive analysis of the diagnosis can be clear. If the baby has a bowel movement once a week, it should be taken seriously and go to the hospital in time for consultation and treatment.