T.A.
Hi D.,
Lol...I am 26 year old stay at home mom with a 16 month old son and I am 4 months pregnant too! I was so suprised to see you are in my same situation. As far as the biting goes all I can tell you is when it seems my son bites and what I do. It seems like he bites if he is tired or frustrated. Maybe not getting enough attention from me or dad. It is most important not to make a big deal about it cause that might be exactly why he does it...attention. Also it might help to simply avert his attention to a toy or something he can chew on. I wouldn't recomend biting him back though..that just teaches him it's ok to bite, then its just a game! I hope I have been some help. Good luck!
T.