I would love to tell you that they can't make you do anything. However, my DS1 was born in hospital, and they literally forced the pitocin on me. I was sitting there holding my newborn son and a make nurse comes around with the pitocin. I asked him what it was, and when he told me, I said "No. I don't want it." "It's hospital policy" "I don't need it, don't give it to me" "But I have to..." He then put it in my IV drip.
I have since learned that hospitals are not subject to phrases such as: "No" and "Don't"
If you want someone to listen to you in the hospital, you have to memorize the phrase "I Do not give my consent to _______ ." This phrase is legally binding and if they do whatever you told them not to, they are legally liable.