My 4 month old is a thumb sucker (has always refused bottles and dummy). My friend recently told me that her 3 month old also sucked her thumb but she 'put a stop to it' by giving her a dummy, her reasoning being that she would be able to take a dummy off her when she was older and wouldnt be able to do that with a thumb. Is it just me or does this sound a bit strange? Does it really matter if a baby sucks it thumb anyway?