Hey Lisa,
We started giving my son the YoBaby organic yogurt when he was 6 to 7 months old...and he did fine with it. Also, around 8 months, my son started refusing baby food all together (we had only tried the stage 1 and 2 at that point). We tried to get him to eat the stage 3 chunky foods and he would just gag. I think it had something to do with it was mushy, but there were also chunks and he couldn't figure out what to do with both textures at the same time.
So, we just started doing little pieces of cheese cut up very small, wheat pasta with a little butter, cut up pieces of steamed very soft veggies, pieces of chicken cut up very small (to the point he wouldn't have to chew, just swallow), the gerber graduates line of foods, pieces of whole grain toast with hummus...and I could probably name lots more. But you get the point...very healthy "real" food.
And, my son didn't get his first tooth until he was 10 months old, so you can definately give textured, solid foods without them having teeth. But, we never had any problems with these foods hurting his stomach. Of course just stay away from the major allergy foods until closer to the first birthday...peanut butter, eggs, honey, strawberries, etc.
Good luck!