DD is 9 months and she's never been able to sit up unaided, she can't roll over, can't hold her bottle or cup, has only just started to attempt to feed herself. Now I hate it when people compare babies and I don't fret really and I've been thinking she will just do things when she's ready. I had a chat with HV yesterday and mentioned these things and also that she constantly arches her back, she's not in discomfort, or doesn't appear to be, generally a happy baby and sleeps well, but I told HV that even if she could sit up when she arches her back she will go flying back, she does this all the time, sitting, laying, playing with toys , when eating, etc. HV has now said I need to get her checked by my gp for possible development issues. I'm concerned now and hope she's ok, I'm sure if she's not we will get the help she requires. Has anyone else experienced this? Thanks