N.H.
Hello, my daughter does this too, I talked to her dr about it and he said she is just playing with her tongue or she wants attention. Most of the time it's the latter! But she also does it when she really wants her binky, I know she probably shouldn't have binky anymore but if it's either that or throwing up she can have her binky. But the dr said to ignore it and we do unless she really gets messy and now she rarely does it. If he doesn't use a binky try giving him a bottle or sippy cup whatever you're using, anything to distract him from his mouth. Good luck