Own of my twins has become become irritable and cranky since last few days...she got cough, cold and then that got better..but then again she got it back .. is that the reason...she is recovering.but yet it's very difficult to handle her tantrums..she is very stubborn and will cry and cry unless we do what she wants us to...is this normal for the age, is it a phase? she has always been very happy and silent child since day 1... playing of her own...but now she is exactly opposite...