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He is 100% fertile at the time of birth. Fertility declines with age.

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15y ago
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Q: When does a boy become fertile?
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Related questions

What changes in the reproductive organs during puberty allow a boy or girl to procreate?

In males, the testis become larger and can produce mature sperm. in males, the ovaries become fertile. Only fertile sperm and eggs can reproduce.


Can you be pregnant if you are fertile?

yes, you have to be fertile to become pregnant.


If you have had pid how do you become fertile?

More than likely you are still fertile if you have PID.


How get teens pregnant?

The exact same way adults do. Boy has sex with girl. Sperm enters egg. Egg grows into a baby. Age is irrelevant. The age a boy and girl become fertile is different for everybody.


Can using aloes after sex get rid of sperms that may be in the uterus waiting to become fertile?

what can get rid of sperms that may be in the uterus waitin to become fertile


Is it possible to get a girl pregnant if the boy is 13?

yes, if the girl is fertile.


What age does a girl kitten become fertile?

5


Is a boy always fertile?

Yes, however sperm count decreases with age.


How do men become not fertile?

well by doing the right thing.


How do volcanoes become beneficial?

The soil around them is very fertile.


What did the Phoenicians become since they had no fertile soil?

They had limited fertile soil and an expanding population, so they added trading to their income earnings.


What do you can be fertile mean?

Fertile means you can get pregnant or get someone pregnant. For a girl it's ovulation and menstruation and for a boy it means sperms are now live and kicking in his semen.