One of my twins is 3 months adjusted age (she was 4 weeks early) has recently started smiling much more and becoming generally very sociable. However quite often she will be happily smiling away and then it will turn into a whingey kind of cry (not tears and not really crying but a whine sound). She also whines without smiling sometimes. is this normal? what does it mean? what can i do. also happens sometimes when she gets put in her cot during the day. she sleeps through the night and goes to bed fine but hates the cot during the day. she has never made this sound when being held. her twin doesnt seem to do this he either smiles or cries properly!!!!
many thanks