A three-month-old baby who does not poop for a few days may be suffering from underfeeding, constipation, or intestinal obstruction, which can be treated with general therapy, medication, or surgery to help the baby pass stools. A three-month-old baby not pooping for a few days may be caused by the baby eating less and having less food residue. Usually there is no need to worry, this is normal, you can let the baby increase the amount of food and gently massage the baby’s abdomen to stimulate intestinal movement and promote bowel movement. If the three-month-old baby does not poop for a few days, and the number of bowel movements is reduced, the feces is hard and difficult to defecate and other symptoms, then the baby is constipated. You can use corkscrew to soften the stool, promote the discharge of feces, but also use lactulose to increase intestinal peristalsis, bifidobacteria triple live bacteria and other drugs to regulate intestinal flora imbalance, so as to improve the symptoms of constipation in babies. In addition, the baby does not poop for a few days, may also be caused by certain organic lesions, such as congenital megacolon caused by intestinal obstruction, usually accompanied by vomiting, feeding difficulties and other manifestations. Surgical treatment, such as laparoscopy-assisted megacolon radical surgery, is needed. Parents should pay attention to the fact that their three-month-old baby did not poop for a few days, and if the symptoms cannot be relieved, they should consult a doctor in time and be treated accordingly by the doctor. The above medications need to be used in accordance with medical advice.