Hi Sara
I know he's only a puppy but there are some things he needs to learn early - like no chewing on the baby

He is slowly learning the leave command and baby is learning to fight back and is pushing him away. What is 'scruffing'? I say leave in a deep, loud growly voice which is slowly getting through to him and I try and distract with a toy, not always with success. I only thought about the water spray because we used it with our greyhound which worked wonders.
We do have a crate which is his safe place, and we don't leave him alone with either the baby or the other dog.