Infants who have pinworm infection in their body, the anus will be itchy, and even there will be pinworms crawling out of the anus at night, you can also go to the hospital for pinworm perianal examination, such as perianal swab swabbing method or transparent adhesive paper pasting method for pinworms and eggs detection, to observe whether there is a pinworm infection. 1. Anal itching: the most obvious symptom of pinworm infection is frequent anal itching, and some babies sleep at night, part of the pinworms will crawl out from the baby’s anus, parents can observe whether there is a white and relatively small thread-like worm in the baby’s anus around the activities, if there is a need to actively deworming treatment. 2. Pinworm perianal examination: If parents suspect that the baby pinworm infection and can not judge by themselves, it is recommended to consult a professional doctor for perianal examination, such as perianal swab swabbing method or transparent tape paste method for pinworm and egg detection, to observe whether there is pinworm infection. If the baby has anal itching and other symptoms, it is recommended to go to the hospital in a timely manner for relevant examinations, a clear diagnosis and then follow the doctor’s instructions for targeted treatment, so as not to miss the opportunity for treatment.