The early symptoms of perianal abscess in babies are as follows: first, the baby will have discomfort, crying and some discomfort; second, because of pain in the perianal area, the baby will generally have changes in bowel habits, such as constipation or diarrhea, etc.; third, the most important clinical manifestation is the appearance of a red and swollen mass in the perianal area, which is initially hard in quality, locally red and swollen, and not broken. At the later stage, the mass slowly becomes soft, and there is a sense of fluctuation in the center, and the formation of liquefied foci can be detected by ultrasonography at this time, which is the formation period of perianal abscess. In this period, it is recommended to perform abscess excision surgery as soon as possible to avoid the formation of secondary anal fistula.