Three-month-old babies a few days without defecation may be associated with tummy, lack of water, constipation, etc., you can pay more attention to observation, give the baby appropriate water, the use of probiotics to regulate, and in severe cases you can use corkscrew. 1. Saving stomach: if the child’s mental state is not abnormal with the usual, normal milk, no crying and other bad emotions, may be the baby’s tummy, this situation can be more observation, the general effect is not big. 2. dehydration: if the baby is formula-fed, there may be a lack of water, dry stools can easily cause a few days without defecation, you can give the baby appropriate water, lubricate the intestinal tract, to help smooth stools. 3. constipation: baby constipation, can be used under the guidance of the doctor Kesler, constipation caused by discomfort, pay attention not to use for a long time, to prevent dependence. At the same time, you can take oral probiotics such as bacillus subtilis bacillus granules to regulate the stomach and intestines, to help relieve the symptoms. It is recommended that three-month-old babies who do not have bowel movements for a few days should seek medical advice and be treated under the guidance of a doctor. The above medications should be used in accordance with medical advice.