Yeah I would say they could get along no problem. It depends on how your baby is and how the new puppy is though. I have 2 boys, one loves all other dogs and most other dogs play with him fine. My other boy though, he is a mamas baby and when another dog comes around at first he is scared, then he gets aggressive. Its almost funny because he's 5lbs of bristled hair and big brown eyes growling and snapping like hes 90lbs!
I put him away though, he is just scared. I could not get a bigger dog while I have him, he's just too scared. It wouldn't be fair. If your baby is good with dogs, then sure go ahead. Supervision, close supervision is a must though.
My brother has a 90lb choco lab/ pitt mix, shes an angel. She is sooooo good with my dogs all the time, never growled, snapped or anything. But I wouldn't even leave her alone with them unsupervised. You never know what goes on behind closed doors.