some do, some don't. i don't think it's a big deal, really, in the sense that you're the mum, you'll have a good feel for if they're ready to pick the food up and try to eat it. if alarm bells go off and you think that the baby isn't really strong enough to sit up (which might increase the choke risk) then you'd hold off. if not, you wouldn't. what you might find is that the baby herself doesn't pick the food up, which to my unmedical mind suggests that her hands might be developing in tandem with everything else, and when she gets the co-ordination together to pick it up she'll likely be able to do the rest. as i say, at the end of the day all of this stuff is up to you. main thing is that you're not freaking out, because that's going to be more detrimental to a child's relationship with food than the actual delivery method, iykwim? so as long as you're happy that she's propped and can sit for short periods, and you're at 6 months and she's doing it by herself, well, seems good to me.