Squishmallows come in 3.5” (Clip), 5”, 7″, 8”, 11″, 12”, 13”, 14", 16”, 20”, and 24” (13” has been discontinued). Size availability varies per each retailer as some retailers have exclusive sizes (7″, 11″, and currently 24″).
Many exclusive squads only come in a few sizes so you may have a squad that comes in all 7 average sizes or you may have a squad that only comes in one.