Though I know not much of a comparison to a new baby, we recently had 4 visitors staying at our house - 2 of which were young kids. Tayda has been known to be impatient with children. Never bitten or anything, but definitely showing body language that she is uncomfortable when "little people" approach her. She has lunged toward children before, never biting, but more of a "back off" move.
We basically told the kids from the get go to COMPLETELY IGNORE the dogs. When we walked in, of course the dogs ran up to them to investigate, and we told them to just turn away and ignore them. We all went about our business with me and Ondrej giving them their normal attention but the kids ignored them. Over the course of the week - we would give treats to the kids to give the dogs and slowly let them pet the dogs after they told the dog to sit (and the dog responded by - sitting. lol)
By the end of the 2 weeks - all was well and kids/dogs were harmonious. Cuddling together and sharing the "dogs couch."
I think it just helped the dogs to warm up to the kids on "their terms" vs being bombarded with strange people/smells/actions. By the time we let the kids pet the dogs - the dogs were dying to get some affection and attention from the strange new little beings in the house.
just my 2 cents.