Undescended testicles will usually move down into the scrotum naturally by the time your child is three to six months old. If the testicles don't descend by six months, it's very unlikely they will do so without treatment, so a surgical procedure to reposition one or both testicles will normally be recommended. This procedure is called an orchidopexy. The operation should ideally be carried out before your child is 12 months old. This is because waiting longer than this may increase a boy's risk of developing fertility problems or testicular cancer later in life.