A large scrotum in a newborn may be normal, but it may also be abnormal, and the main causes include physiological factors, syringomyelia, and congenital testicular tumors. 1. Physiological factors: newborns are born with large testicles, which is a normal performance, because each newborn’s testicular development is different, the size of the testicles varies, and there are some differences in body weight as well as physical development. However, under normal circumstances, the body has no other adverse reactions and no pain, so there is no need for special treatment. 2. Syringomyelia: The testicular size of newborns caused by syringomyelia is abnormal, which is usually seen in preterm babies with family genetic history, and can be detected by transillumination test. Most of the newborns can recover by themselves in a few months after birth. If they cannot recover by themselves, they should be treated with surgery as soon as possible, such as high ligation of syringomyelia. 3. Inguinal hernia: you can feel the lump in the scrotum, this lump in the baby crying, can be shown to increase in size, in the lying down or coaxed to sleep, the lump and gradually shrink, at this time more is the existence of inguinal hernia. Inguinal hernia is more often caused by the inner ring of the groin is not closed, part of the need for surgical treatment. 3. Congenital testicular tumor: usually related to genetic factors and drugs used during pregnancy, which is an abnormal performance, should be taken as soon as possible to surgical resection, after the operation should be regular local change of medication to avoid secondary infection. There may be other reasons for large scrotum in newborns, such as testicular and testicular attachment torsion, trauma, etc. Please go to the hospital in time, and actively diagnose and treat to avoid delaying the condition.