I knew from the other reviews that these run way small and ordered up.  As others noted, DEFINITELY order up.  Even if you think your child is small, order up.  I am giving five stars assuming that you are ordering up.  It's not hard to see why the larger size is often out of stock.  Having said that, though, the prints are super cute (we got watermelon/pineapple and my daughter likes the watermelon ones, especially) and the fabric is really soft.  The padding is sufficient, but not too bulky.  I would order again if I could find the larger size in another cute set of prints.