I think the reasoning with respect to teratogens is broken when you take abortions into account. Consider, for example, the woman whose abortions is scheduled for next tuesday going on an alcoholic binge the preceding weekend. No baby will exist to be harmed, so where is the justification for locking the woman up?

It seems to me that in principle, the more ethically sound solution is to accept that any baby subsequently born from the pregnancy may have a cause of action against its mother. The standards could be the same as for any normal civil suit.