Cryptorchidism, also known as undescended or incomplete testicular descent, may also occur in low birth weight babies. Cryptorchidism is the failure of the testicle to descend into the scrotum according to the normal course of development, which may cause infertility or malignancy. For smaller children, the testicles may descend on their own, but the chance of cryptorchid testes descending decreases significantly after 6 months of life, and the descent rate after 1 year of age is about 1%. There is generally no direct correlation between the body weight of the child and the condition of cryptorchid testes, so cryptorchid testes may occur in low-body-weight children. Children with cryptorchidism may not be treated directly in the early stage, pay attention to observe the testicular changes, if the testicle has not descended after 6 months after birth, we should not wait blindly, patients can be treated by surgery to improve the symptoms of cryptorchidism. It is recommended that children go to regular hospitals in time, pay attention to develop good habits, pay attention to rest, avoid strenuous exercise, follow the doctor’s instructions for regular follow-up, and if there is any maladjustment, consult the doctor in time.