Swelling in the small of your child’s stomach after circumcision may be caused by urinary retention. Circumcision is the removal of the excessively long foreskin, usually by making a straight cut on the back of the penis and then cutting a circle of excess foreskin horizontally. Patients are prone to localized edema after surgery due to poor blood circulation to the foreskin, leading to a poor urethral opening, painful urination, etc. If a patient has prolonged urinary retention it may lead to a distended bladder, which can cause a small swollen tummy. After the circumcision, patients can use iodophor and other disinfectant to disinfect in time, to relieve the swelling, but also follow the doctor’s instructions to take antibiotics, such as cefixime, amoxicillin and other drugs for anti-infection treatment. At the same time, the patient should also pay attention to light diet, keep local cleanliness and hygiene, if the long time urinary retention can not be relieved, can promptly consult a doctor.