Children’s itchy buttocks at night may be due to local cleaning is not in place, allergies and pinworms and other factors. 1. Local cleaning is not in place, small children after defecation, due to the lack of timely cleaning around the buttocks or cleaning is not complete, will result in local excreta residue, stimulate the buttocks, small children and more sensitive, itchy symptoms will be obvious. 2. Local allergies, if the child’s clothing is not suitable or shower gel is not suitable, may lead to local allergies and itching symptoms. 3. Pinworms, when a small child is infected with pinworms, they will lay eggs near the anus at night when the child is asleep, and the stimulation of the eggs will lead to itchy manifestations in the child, which are usually small white thread-like worms. Children’s itchy buttocks at night, it is recommended that timely consultation in the regular hospital, follow the doctor’s instructions for treatment.