baby sucks thumb a lot

Audrey
So we don't use a pacifier. We tried to introduce one when times were a bit more difficult but she didn't want it.
Baby discovered her thumbs a while ago but since about a week she goes at it every chance she gets. 
It started to be a new signal she used when she is hungry and that was fine with me but now it's so often it can't all be hunger..?
Anyone else have that happen?

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