Well, I don't know much about this particular situation but I'm sure that if you just make him feel at home, pet him and hold him and let hin know he's safe, he may start to open up. Something like this happened to me when my great-grandmother was put into a resting home, and her cat was given to me (or should I say taken as soon as I was given permission?
) But anyway, he was very scared and seemed wary of the house and our other pets. He hid underneath our staircase, but I stayed there with him every day, and petted him and talked to him all the time. He eased up very quickly and slept on my bed with me every night. We grew very close through my introducing him to our house, and as he had been in his other home 7 years I believe, he came around surprisingly quickly. You'd be very surprised what a little extra care can do. Hope this helps, good luck with your new baby!!!