I had to train my first early, newborn age, and pull fingers out of mouth. I think it took a while but eventually she got it. That was one habit I didn't want her to have. I had a friend who sucked her thumb well into high school!

He gets so mad but we do that so he sucks on his fingers..like his dad did when he was a baby but I will push the Paci as much as I can loo

just keep pulling his thumb away and replacing it with a binki my son was like that