Poly-Vi-Sol cause gas?

I'm surprised your doc recommended vitamins this early. Usually they're not recommended until 2 months old. Also, if you're eating healthy and taking a prenatal, your baby will get good nutrients from the milk. Unless your baby seems unhealthy or isn't gaining weight, I would stop the vitamins (but that's just my opinion). If your worried they're causing the gas problem, take her off them for a week or so and then try again. If its the vitamins causing the gas problem, you'll know for sure. Good luck!