My DD, 7 months, rarely puts anything in her own mouth! She studies things intently with her hands, looks closely at them, tears them apart and then just puts them down.
I hadn't really thought much of this until we started weaning. Apart from when she has had trouble with her gums and no teethers etc would help. She sucks/chews on her own fingers but that's it.
I have gone down the puree route, mainly for this very reason, and she will eat from a spoon like a little baby bird (most of the time!). I always give her a spoon while I'm feeding her and when I give her chunks of food, like banana, pear, toast etc I make sure she has some of her own in the hope it might one day make it in the right direction!
Is it unusual at her age not to be experiementing with her mouth?