My dogs did this when my sister was born, at least until she was moving around on her own. Whenever you put her down to change her, they'd lay a few feet away (

My dogs did this when my sister was born, at least until she was moving around on her own. Whenever you put her down to change her, they'd lay a few feet away (one on each side) and growl if anyone they weren't sure of tried to get too close. I don't recall them ever growling at anything else, and were fine with visitors at any other time, so it really stood out.