If your child's testes have no not descended to the scrotum by the time they are 6 months of age, you need to consult your doctor.The reasons why you should not ignore:

Fertility problems: they need to be kept a bit cooler than body temperature. Early treatment can make a difference.

Hernia: There is usually an inguinal hernia on the side with undescended testicle.

Risk of injury: Chances of injury are higher than a normally places testicle.

Testicular torsion: Chances that it may twist are higher in undescended testicles.

Risk of cancer: Men who have had undescended testes tend to have a higher risk of testicular cancer.