To determine whether the baby is megacolon can be judged from the clinical symptoms and related examination. 1. Clinical symptoms: the main clinical symptoms of babies with megacolon are stubborn constipation and curled-up abdominal distension, etc., and some of the babies are constipated even if the effect of the use of ophthalmic solution or enemas is relatively poor, and if the above is the case, then it is considered to be megacolon. 2. Imaging examination: if parents can not judge through the symptoms, you can take your baby to the hospital for imaging examination, that is, through the colonography, you can clearly observe the degree of narrowing of the diseased segment of the intestinal tube and the degree of dilatation, and also can do rectal lateral compression or rectal mucosa biopsy to make it clear. If your baby is suspected to have megacolon, it is recommended to consult a doctor in time to clarify the cause of the disease and to carry out targeted treatment or therapy with the help of the doctor.