Its the same as bringing a new puppy in. When you bring baby home, have the dogs in the bathroom or something. Keep them in there, or other rooms other than you baby's. Then put them away, move your baby to another room, and let them smell baby's stuff. Do this a few times and introduce them one at a time. As far as them being pit-bulls its your judgement call. You know them better than anyone else. We have two female labs and the day we brought my son home, they sat in front of him and stared, not moving, for like 3 hours! Now they just step right over him like he's not even there. One of them sometimes steals his binky's from his mouth, but they have never hurt him... Let me add, that one will always be in the same room with him, and if I'm not there and he starts crying, she'll come running for me!