I am a little worried about my ds2, now just 6 months old. The thing is, he doesn't seem to be doing very much. He doesn't completely support his head, he doesn't sit, he doesn't roll over, he doesn't reach out for toys, he doesn't grab, he doesn't even grip things. He is bright and alert and shows an interest, he smiles and responds by kicking his legs up and down, but that's about it. Is this normal at 6 months?
I also have a ds1 and a dd and they both did all those things by then. I know I shouldn't compare, but it is very hard not to, especially when the difference is so vast.