Boy, I had all that switching written down, saved. But since I moved, and different computer, can't find anything. But Belle got Mimi's baby, and it died, if I remember right. Yes, sperm was switched, but the petri dishes were also switched. That was the Black hand.
So, yes, Belle carried the Philip/Mimi baby, while Mimi's surrogate carried the Belle/Shawn baby. Belle's pregnancy ended in the baby not making it. By the time the surrogate delivered the baby, (that both Philip & Mimi figured was theirs), Philip found out he was not the father of Claire, it was Shawn, and he just wanted to leave town so they gave the baby to the surrogate, who ended up leaving it at the hospital, which is where Kayla found it, she & Steve were going to take it, but another couple ended up being the adoptive parents (Child Services). That is Tyler......who would be Claire's younger brother.