A child’s bowel movement once every 3 days can be seen in physiological phenomena, pathological conditions (e.g. functional constipation), whether it is normal or not needs to be judged according to the baby’s specific situation, if it is considered as functional constipation, then it is not normal. 1. Physiological phenomenon: For children who used to have bowel movements about 2~3 days apart, if the above phenomenon occurs, and the bowel movement is smooth without any difficulty in defecation, etc., the general condition is good, and it is usually regarded as normal, so just continue to observe. 2. Pathological conditions: For children who used to defecate once a day, if the interval between defecation is significantly prolonged, such as defecation once in 3 days, and some of the children may be accompanied by dry stools, difficulty in defecation, which affects the defecation, it is usually regarded as functional constipation, which is not normal. Probiotics such as bifidobacteria can be given to regulate the bowel. It is recommended that children who have bowel movements once every 3 days and are accompanied by other discomforts should be seen by a specialist for evaluation and judgment. The above medications should be used in accordance with medical advice.