My DD is 3mo. She's been trying to suck her thumb since birth but can't manage it yet. We've tried giving her a dummy which she is only interested in when really tired but we spend most of the night putting it back in for her as she knocks it out trying to such her thumb. She's also very noisy trying to do it so despite her not feeding much in the night were not getting much sleep!! We've tried feeding her in case it's feeding queues but she doesn't want the bottle until about 5am. Any tips???