DD is 5 months and 1 week and so far has not really made any move towards rolling. She has found her knees and her feet, and is pulling her knees up about half the time she is on her back, and from here has almost made it onto her side a couple of times but no further. A few times she has rolled from her tummy onto her back, but I'm not sure if this hasn't just been accidental as she seems to hate tummy time (wails after only a few minutes), but generally seems to get stuck there, flapping her arms behind her rather than roll over to get onto her back. She is also not yet pushing up on her arms when on her tummy, but can only keep her head up when her arms are bent and tucked into her chest.
Not sure if relevant but she has been checked out by a paed physio a couple of times (had torticollis) who has always said that she has good muscle tone and strong head control.
Is not rolling at this age really nothing to worry about or should I be concerned that she has some developmental delay? (I am happy for her to develop entirely at her own pace, btw, just have read a number of things which seem to imply rolling happens at 3-4 months, and all the other babies I know at this age seem to have been rolling for ages!)
Thanks