Palin as martyr?

I'm glad Palin has 5 children as that's her choice. However, I don't like this "martyrdom" she and others have created for herself because she has a kid with Downs. Is it really admirable for a woman to choose to carry a child with a disability to full term? Or is it their own personal responsibility to do what is right for themselves, their family and their particular situation at the time the news is given?