Most, if not all, of the regulars on this board would say never. A pet is a commitment for life.
Whether she likes your child or not, your dog is emotionally attached to you and your H. She would feel abandoned in the new home, not relieved to be away from your son.
Also, your baby will not be a baby forever. My son just turned a year, and we are already teaching him appropriate interactions with dogs (for example, we do not poke our fingers in doggie's eye sockets), and I give a short, sharp "Eh eh!" when I see him heading their way. He changes course and heads for something else.
If your dog won't voluntarily go to her safe place, take her there. Lure her with a treat, or a stuffed Kong, so she doesn't feel like she's being punished. My pit bull voluntarily spends the day asleep on our bed but sometimes I have to tell my Australian Shepherd, "Go to bed," because she's a shepherd and feels like it's her job to "guard" us from the strange noises in the apartment common hallway.
I know I am responsible for my child's safety, but I treat my dogs like family members and I don't think my child "trumps" my dog. I am responsible for my dog's comfort and safety as well.