Birth defect? Genetic mutation?
yes you can (I did)
he was born with one testicle lolol
If your baby's doctor has confirmed that he only has one testicle, not one descended and one undescended - he should have explained to you that the baby will function completely normally.
Have sex with a woman. One is enough.
No
Yes, as long as the testicle is functioning properly then you can reproduce with one testicle.
I can only think of one, and that is he was born with only one testicle.
Yes, he has only one testicle.
Yes
Can a man with one testicle breed? The answer is YES
Your sexual life and fertility haven't got anything to do with you having one testicle. It is all normal. During contacts sport there's nothing more major than protecting your one and only testicle. If you have suffered undescended testicle while u were a baby, research found out that there is slight risk of infertility.
Many males have a testicle , which is larger then the other one.