The body of the baby, however, is not affected very much, or at all. This is because the brain is very, very delicate and sensitive to chemicals such as hormones. When the baby is born, it appears normal . It looks like a normal boy or girl. However, the brain inside the baby is a brain of the opposite sex .
Brains have sex.
They have unique circuitry for male brains and for female brains. This is true of all sorts of animals. This birth defect happens to rats, cats, dogs, apes, birds, and every other sort of mammal. We cannot tell if it happens to things like snakes and bugs and lizards and such. Their behavior is too difficult to determine.