Obviously (to some here, it seems) the answer is internment camps for pregnant women, to make sure that the moment a woman gets pregnant, she eats right, sleeps enough, doesn't drink or smoke or do anything else bad. We can't trust women to handle something as important as pregnancy on their own.
(Do I need to do the "/sarc" thing?)
When you indulge in this level of hyperbole, it means that you have no real argument to make.
We hold parents legally liable for abuse and negligence of their born children as well - apparently you are under the delusion that all American parents are currently housed in internment camps.
In fact, the conservative position is that we can't trust women to handle pregnancy "on their own" (nor men, for that matter), since, in fact, many women kill their children. It makes no sense for a conservative to argue that abortion is immoral but that it's perfectly moral to expose the same baby to harmful substances for no other reason than that the mother is addicted. Makes no sense whatever.