Quitting is never easy. There are always temptations. Sometimes the stress of a new baby sister can drive a kid to their old comfort zones.
Or maybe she's just goofing around. There is always that possibility.
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Cute.... reminds me of my oldest (who was almost three when baby bro came home.) After months of not sucking his thumb, he resumed the habit when his brother came along. He quit a few months later. Definitely seemed strongly correlated.
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