I think the heated debate on this topic really comes down to Roe vs. Wade. If a person believes that a pregnant woman should be allowed to abort her baby, then that person probably also believes that a pregnant woman should be allowed to abuse her unborn baby. If a person believes abortion should be against the law, then they probably agree that a pregnant woman who drinks during pregnancy is violating some type of right.
I agree that there isn't a way to criminally prosecute a pregnant woman for drinking; but that doesn't mean I don't wish things were different. If a woman gave an infant whiskey instead of formula, her child's doctor or child care practitioner could refer her to social services and she could be convicted of child abuse. Yet, because the baby is still part of her own body, she is allowed to mistreat it however she wants.
I think it also should be noted that there is a difference between eating too much pizza and drinking alcohol, in terms of the lasting effect it has on the baby.
Just for a reference, I AM a pregnant woman, and I have had other pregnancies in the past. I do what I can to provide nutrition and other necessities for my child, just the same way I do that for my children who are already born. I may not be perfect, and I may not follow all the "rules" of pregnancy to a tee (I admit it - I don't work out as well as I should, and sometimes I eat ice cream, ha ha). But I also don't do anything that I KNOW will endanger my child's future health, like drinking or doing drugs. It hurts my heart to see a pregnant woman who smokes cigarettes, for example, because I know that that baby inside of her is smoking too, and he or she didn't have a choice in the matter.
We have all heard horror stories about child abuse, and I would like to think that we all feel heartbroken about it. In my opinion, this issue is hardly different. Then again, in my opinion, a fetus is a child just like a toddler is a child, or a teenager is a child. If a child is being hurt, I wish we would have a system in place that would stop that hurt from happening, no matter WHEN it happens.