If a 2-month-old baby is not having bowel movements due to fasting, there is usually no need to worry too much, and the baby can recover after the fasting is lifted. However, if the constipation is caused by intestinal flora disorders, it can be treated with probiotics such as bifidobacteria under doctor’s guidance, and if necessary, it can be laxed with Kefir. However, we also need to be vigilant against intestinal diseases such as congenital megacolon. Some babies may need intravenous nutritional support and fasting as prescribed by the doctor during hospitalization due to the disease, which can cause a decrease in bowel movements. This can cause a decrease in stools, which can usually return to normal after the disease improves and a normal diet is prescribed. However, we also need to be alert to the presence of congenital megacolon, intestinal malformations and other diseases, which can lead to abdominal distension, vomiting, delayed defecation and other manifestations of the baby, you can improve the abdominal ultrasound, abdominal CT, abdominal X-ray, lower gastrointestinal tract imaging and other related examinations, and if necessary, need to be surgical treatment. If your baby has not had a bowel movement for 5-7 days, you should consult a doctor and follow the doctor’s instructions for targeted treatment.