Circumcision is a surgery to remove the foreskin, a fold of skin that covers and protects the rounded tip of the penis. If it's done, circumcision is usually done soon after birth.
There are both benefits and risks to newborn circumcision. The decision whether to have a baby circumcised is often based on what the parents prefer.
Some older children and adults need circumcision to treat problems with the foreskin of the penis or for swelling of the tip of the penis.