of all, things like choosing eye color, choosing gender, that it happens much more often in invitro fertilizationecide which to implant. it doesn't happen very much at this point in terms of aborting a child. the kinds of tests we do in pregnant women, prenatally, tend to be disease-oriented tests. then parents are faced with a challenge. should they actually maintain the pregnancy in the face of sometimes devastating disabilities in their children? i think that that's a decision that each couple, each mother, each parent needs to make individually. >> the case that some people make for having those tests too and knowing that is once the child is born, it makes it easier because they know what's ahead of them. is that a legitimate point that's being made, do you think? does it make it easier, in fact, to deal with what comes with the birth of a child who may have some sort of abnormality? >> i think it's clear that knowing that your child is going to need special care of some kind allows parents to plan for that early on. in down syndrome, the special care may not be particularly, you know, compl