My dd is 12 weeks tomorrow and I am concerned that her head is still quite unsteady. When she is lying down I can hold her hands and she will pull up to a sitting position but her head will more often than not flop forwards as opposed to being straight. I have not really lain her on her tummy much but over the last few days I have and she can only raise her head very briefly - she seems to try to kick more with her legs to try to move her body. Should I be concerned? I am a first time mum.