The other answers explained the difference between a sitter and a supported sitter.
I will say, the SINGLE ingredient Gerber baby foods are THE SAME, no matter what stage they are. The “supported sitter” jars are 2 ounces and the “sitter” jars are 4 ounces. Now, if you get into the 2 ingredient ones, or the yogurt blends, or the “texture” ones, then yes, there is a difference.
I got my daughter a jar of the “crawler” stage green beans, and they were totally liquid, just like the lower two stages.
foods for supported sitters are practically liquid and one ingredient foods, sitter foodds may be a bit thicker and include a mix of ingredients
supported sitter is when the baby cant fully sit by itself and sitter is a baby who can sit by themselves.
It’s just marketing BS trying to hustle naive parents into feeding processed slop to babies too young for solids — pay no attention.
Gerber makes a LOT of total junk; the single-ingredient stuff is pretty basic (albeit watered down) but lots of the “dinners” and most of the “snacks” are very junky; read ingredient labels carefully if you are heavily reliant on convenience food for baby.
Useful links: http://www.kellymom.com/nutrition/solids/delay-sol…