At 9 months my LO doesn't really do much and I don't know whether I should worry, she has no idea how to crawl and can't get on her knees or even make any attempt to, she can't hold herself up standing and doesn't try and spends lost of the time just sitting still! She cries if she goes from sitting to her tummy! She also doesn't babble much only the odd baba every so often js this normal? So many babies by now seem so advanced in comparison