I was so very lucky with carrying my own babies, but shared a loss earlier on in the year when my son and his wife lost their first baby, my first grandchild.
They coped in different ways, to my son the baby had never seemed that real, so he was sad but not totally knocked off of course. His wife felt it a lot deeper, the baby was already real to her, in a way that I think a man struggles to understand. She took time out to grieve for the little one, and to accept that he was a real person, but had passed, so it was OK to grieve, but then to start looking forward again.
I think that is important, you must grieve the loss, it only right and natural, but then come through that stage and be ready to walk forward again. Some babies are just to special to be born, and they get taken home before you get to love them to much.