My cats were fairly young when I had my son - only a few years old, I can't remember exactly how old. They had never had any experience with children except once, when I am convinced that the boy we had as a supper guest secretly abused one of our cats - because she had been outgoing up until that point, but afterward became fearful. When my son was born, the cats immediately understood, I believe, that he was my "kitten," and that it would *not* be a good idea to do anything except respect him and be gentle with him. They were both females, so that may have helped. They grew to love him as he grew, despite his growing through the natural stages of crawling over top of them and so forth. We taught him from the outset the proper behavior toward cats, and he has always had a special touch with cats. Even cats who would not come to anyone else have come to him, even when he was as young as five. I think that cats can sense your love and protectiveness for the new one, and they understand what it means. If you continue to try to give them love and affection (it will be challenging, because new babies take so much attention), I think that will help, too. I hope you have the baby you so desire.