My 2 years boy having one testicle by birth.can he enjoy his married life normally and having good healthy life.

Here are some...: Apparently, you son has had a common impalpable undescended testis or rare inborn absence of a testis. Most of undescended testes at seen at birth will naturally descend to the sac by age 12 months; beyond that time, further descent becomes less likely if not almost impossible. Most of times, single testis should serve well for such men's life. More? Ask since a 400-letter space is not enough to..

Yes and no: Yes,you only need one to be fertile. However, there is a possibility that the other testis is hiding inside the abdomen where it can cause cause fertility problems or increase his risk of testis cancer in his lifetime. Find a doc that can locate the other testis (ultrasound) and bring it down into normal position or remove it.