I'm looking for a book I read in the 90's...it was about an experiment a couple decided to do on their child to make him smarter. I think the child ended up being too smart or something but I remember it getting kind of scary...his brain got bigger and bigger. I know I'm being vague but I was really young when I read it and it was way too advanced for me but I'm trying to find it!
Mutation by Robin Cook (1990)
Victor Frank, and his wife Marsha, are unable to have a second child due to Marsha's infertility. They turn to surrogacy as an alternate method of conception. Victor, an obstetrician-gynaecologist and owner of the biochemical company Chimera Inc., injects the egg implanted in his wife with an agent called Nerve Growth Factor (NGF) into chromosome six, which causes the baby to grow more neurons than usual, as a result making them super intelligent. Their son, VJ, is born a genius. He is able to talk in six months and read in thirteen.