Unilateral cryptorchidism in babies does not affect fertility, bilateral depending on the timing of the surgery, generally speaking, before the age of two years surgical treatment can be fertile, between the ages of two and six years of age surgery will lose some of the ability to have children, and after the age of six years of age, fertility is almost gone. Cryptorchidism is a condition in which one or both of the testicles of a boy are not traveling into the scrotum, but are stuck in a certain place. Due to the abnormal position of the testicles, the temperature will be different from that in the scrotum, and this little difference in temperature may lead to abnormal spermatogenesis in the testicles. After a long time, the spermatogenic function may be seriously affected. Therefore, once discovered, cryptorchidism needs to be operated as soon as possible. If it is unilateral cryptorchidism, the testicle on the other side is normal, and the normal testicle will be able to achieve the purpose of procreation, so it is not affected, but if both sides are cryptorchidism, then it needs to be operated as soon as possible. Cryptorchidism does not have much effect on the spermatogenic function before the age of two, timely surgery, the future can still be fertile, while two to six years of age for surgery, the spermatogenic function may have some effect, the relative decline in fertility, and after the age of six years, the testicle of the neural function of the serious low, fertility almost disappeared, so once found, need to be operated as soon as possible, specific can consult the professional physician advice.