The following treatments are available for a 3 year old child with an anal fissure: laxatives, sitz baths, and surgery. Constipation is an important cause of anal fissure, so after the occurrence of anal fissure in 3-year-old children, laxative treatment is needed to relieve constipation before the anal fissure can heal. Usually can eat some more fiber food, if necessary, can follow the doctor’s advice to supplement probiotics such as bifidobacteria, etc., to reduce the occurrence of constipation. In addition, sitz bath is an important method to treat anal fissure, you can use diluted potassium permanganate solution and other drugs for sitz bath, which has the effect of disinfecting and promoting the healing of anal fissure. After the laxative treatment and sitz bath treatment, if the anal fissure fails to heal, surgical treatment can be considered, which requires relaxation of the sphincter muscles around the anus, etc., and regular postoperative dressing changes until the wound heals. It is recommended to go to the hospital to be able to determine the severity of the condition, and then you can take the appropriate treatment.