T.G.
My daughter who is 2 yrs, 4 months, has been doing the same exact thing. I originally thought it was after eating, but then realized that was not always the case. I now think that she does it when she wants her lovey. SHe knows that if she has a pain she can have her doggy, so I think that is the cause. I also started to give it less attention and she has done it much more infrequently. GOodl uck!