iExx, that's one of the many reasons you don't get a puppy before a baby comes!
Puppies/dogs don't know how to react to babies, toddlers, or little kids unless they were in the usual daily life from the start.
My dog is okayish with kids and younger in the sense that she just runs away.
My sisters dog? She sees little kids as just mini people, plays the same way as she does with adults. Which results in knocking kids over if she gets too playful. Bad mojo.