Three months of the baby did not poop for three days, should first look for triggers, and then for triggers for treatment and conditioning; common triggers are mainly insufficient milk intake, constipation, intestinal obstruction, etc., can be increased by appropriate milk intake, the application of probiotics, for the treatment of the original disease, and so on. 1. Insufficient milk intake: If the milk intake is insufficient, resulting in too little stool production, caused by the three-month-old baby did not poop for three days. You can start by adjusting the amount of milk, appropriately increase the baby’s milk intake, and pay attention to observe the stool. 2. constipation: if it is due to constipation caused by the three months baby three days did not poop. Can be directed by the doctor to take probiotics, such as bifidobacteria, lactobacillus, etc., is conducive to the regulation of intestinal flora, so as to improve constipation. 3. Intestinal obstruction: If the baby did not poop for three days caused by intestinal obstruction, it is necessary to consider surgical treatment, such as intestinal adhesion release surgery, intestinal stoma, etc. If the baby did not poop for three days caused by intestinal obstruction, it is necessary to consider surgical treatment. The three-month-old baby did not poop for three days, if accompanied by obvious symptoms of discomfort, you should seek medical attention as soon as possible, after clarifying the causative factors, to give targeted treatment. The above medication should be used under the guidance of a physician, avoid self-medication, so as not to cause adverse effects.