Seven-month-old babies did not poop for three days is common for constipation, need to pay attention to increase dietary fiber intake, oral microbial agents, etc., if necessary, the use of corkscrew. It is important to note that babies who have had longer intervals between bowel movements in the past may be experiencing a normal phenomenon. For seven months for most babies, usually daily regular stool, appeared three days without stool may have constipation, some babies may appear stool dryness affect defecation, the age of babies have gradually added complementary foods, according to the digestive tract tolerance, discretionary increase in dietary fiber intake. If necessary, we need to use Keserol to soften the stool, oral microbial agents (such as Clostridium casei) to regulate the intestinal flora, or laxatives (such as polyethylene glycol powder) to relieve the symptoms of constipation. However, it should be noted that for babies with a long interval between bowel movements (e.g., about 3 days), the above phenomenon is normal physiological phenomenon without dry stools that are not easy to discharge, and no special intervention is needed. All of the above drugs should be used under the guidance of a physician. If the child has a poor mental state, vomiting, etc., it is recommended to go to the hospital and be evaluated and judged by a specialist to intervene.