Pregnacy, and gastric byp?

I have a question, not that I want either gastric byp, or to have any more children. It seems as though women are getting gastic byp at younger ages more and more these days. I have seen and read about this and the side effects of this. My concern is that if these young women get this prcedure, and then later decide they want to start a family, would thier body be able to digest and retain enough nitrients and vitamins to maintain a healthy baby? Of course there are prenatal vitamins, but I know if greatly limits the amount of food one can consume.