I have a Kitten which is give or take 5-6 months old and he only has one testicle i'm pretty sure he only has one because all the others have 2, and just like humans they are supposed to obtain 2. But "Momo" aka Mohawk has one and i thought he was just growing really slowly, but the other kitten i have which is about 2 weeks younger than him and smaller has fully grown things. Is this normal in kittens or no?