Gabby Now Fertile???

If anyone caught Desperate Housewives last Sunday night you might just be as confused as I am. The characther Gabby was supposedly unable to have children -- not sure on the specifics, but it was discovered after she suffered a miscarriage. Now, as the show has jumped forward five years, we discover Gabby with two young children. Is anyone else curious as to how these children came to be? Was there an adoption, a surrogate, or was her inability to have children conveniently forgotten for the current storyline???? Enquiring minds want to know.