Is it true that the only difference b/n baby food stages is the size of the bottle? Is there no difference in consistency? We only use Earths Best and the grocery store and Target only sell stage 2 so I've been driving 45 minutes to Whole Foods to get stage 1. All the while another mom tells me at Target yesterday there is no difference. I do love me some Whole Foods so I secretly don't mind the drive but wanted to see if that is true??