My 11 week old daughter has started sucking her hand/thumb really aggressively over the last few weeks. People keep telling me it’s because she’s hungry but it doesn’t matter what time of day it is or whether she’s had a bottle or not she’ll suck on her hand/thumb. I was putting it down to her comforting herself as she doesn’t have a dummy/pacifer. She’s never taken to one so we know we don’t use that to comfort her, she’ll suck her thumb sometimes to get herself to sleep but I’ve become paranoid wondering if she’s doing this because she’s actually hungry and it’s her way of telling me. Should I be worried. ?