Dandruff?

Anyone have bad dandruff? Overall my hair looks dull and feels thinner and I have a lot of dandruff with this pregnancy. I just had my daughter last January and my hair was super thick with that pregnancy and i had zero dandruff.. I'm having a boy now so I don't know if that has anything to do with it.. can anyone recommend anything for the dandruff? Also what other vitamins should I be taking that would help with my hair other than prenatals?