My son is 5 years old and had an orchidectomy (removal of testicle) when he was a baby due to one of his testicle twisting and subsequently dying due to lack of oxygen.
Even at the time this was treated as some kind of joke by extended family members because my son now only has "one ball" however I don't think people would think it was funny if it was a girl's ovary.
My son is aware that if he feels any pain in the scrotum then he is to tell us immediately (or a teacher) because if he loses the other one then he will not only not have any children but he also won't go through puberty.
He is to have a prosthetic testicle (like on Cold Feet ) when he is a teenager for cosmetic reasons.
My dh and I do not know how or when to tell him, we do not want him telling other children as we feel that when he is older he would have the piss taken out of him for his difference.
Do we leave it until he starts doing swimming at school and therefore undressing in front of others? Would anyone even notice (we think it looks very different as one side of his sac is empty)
Does anyone have any experience of this or some other situation?