I am not expert, but will suggest that u should not leave the baby with the dog when no one else is around. Labs r friendly dogs but if he is neglected upon arrival of the baby then he may become jealous. So if u want ur dog to accept ur baby then try not to change his schedules of feeding, playing, etc. Dont let him feel that something has changed. I know its not easy but u will have to as that will ensure ur dog also loves ur baby & accept tha baby as a part of his pack.