My DS is just 9 months old, too. He certainly doesn't eat as much as 2-3 jars of puree per day! In fact, he's been teething pretty hard (he's popped out 4 teeth in 2 weeks) so the last two weeks he hasn't really wanted much for solids, so mostly he's just been nursing.
My DD didn't either... I don't think she ever ate a Stage 2 jar of anything, not even once! the first time she showed interest in anything other than Puffs and purees was at 10 months -- at Thanksgiving dinner. I remember her eating crackers and bits of turkey and I was amazed. She didn't even eat 1 regular solid meal per day until like 11 months and wasn't eating 3 per day until more like 15 months. But she got plenty of breastmilk, so it's not like she was starving. On the flip side, she was the least picky toddler eater I know. She pretty much eats anything nowdays.