If there is only one testicle in the scrotum, it is called unilateral cryptorchidism; if the testicle is not touched on both sides, it is called bilateral cryptorchidism. The germ cells of cryptorchid children are severely inhibited from the second year after birth, and more than 90% of the intra-abdominal testes have lost their germ cells until puberty. Therefore, whether it is bilateral or unilateral cryptorchidism, early treatment is necessary to avoid future effects on fertility, malignant changes, as well as opportunities for reversal and mental factors. Waiting therapy Normally, the testicles have descended into the scrotum at birth, but in some infants, due to delayed embryonic development, the descent of the testicles can be delayed until 3 months to 1 year after birth. Therefore, if an infant has a cryptorchid at birth, there is no need to rush to use medication or surgery to try to reset the cryptorchid, but to wait patiently and expect the cryptorchid to descend automatically. Someone once observed 3612 male infants and found that the true cryptorchid rarely descends after 1 year of age, which reminds us that the therapy of simply waiting without taking active measures is only applicable up to 2 years of age. When is it better for a child to have surgery? The affected child is painless, but the testicles staying in the groin or abdominal cavity cannot develop normally due to poor environment, and cannot produce mature sperm in the future, so that they cannot have children after marriage, and even have the possibility of causing cancer. It has been proved that cryptorchidism starts to be damaged from the age of 2. Therefore, the most suitable age for surgery is around 2 years old, or earlier, but it should never be too late to avoid missing the good opportunity.