UNDESCENDED TESTICLE

A testicle that hasn't shifted into its correct location in the pouch of skin that hangs below the penis (scrotum) before birth is known as an undescended testicle, or cryptorchidism. Usually just one testicle is impacted, however in 10% of cases, neither testicle descends.
In general, undescended testicles are rare, however they are somewhat common in prematurely born boys.
During the first several months of life, the undescended testicle usually finds its right position on its own. Surgery can move your son's undescended testicle into the scrotum if it doesn't straighten out on its own.
Symptoms
The primary indicator that a testicle is undescended is the inability to see or feel it where one would normally find it in the scrotum.
During fetal development, the abdomen is where testicles form. The testicles gradually descend from the abdomen into the scrotum during the final few months of a typical fetal development. This tunnel, known as the inguinal canal, is located in the groin. The process either halts or is slowed down when a testicle is not descended.

When to visit a physician
Most often, an undescended testicle is found during a postpartum examination of your infant.