It's hard to tell that early, but some doctors can catch it in time. Signs would be heart defects or growth delays.
The frontal lobe is responsible for reasoning.
Flea Shampoo actually works wonders. My cousin had lice and flea shampoo got rid of them. Just wash her hair with it a few times
They are called lymphocytes, which are a type of white blood cell. I hope this helps! :)