I find it sorta stupid that companies don't release what they designed the product measurements around. I understand that a child's growth grows differently and is hard to pen point, but I can tell you right now they have data showing average waist, hips, and etc for said diaper. They don't just make them and assume "oh this will fit 55 lbs".
Personally I think all products should show weight ,hips, and waist measurements. Regardless of what people might say showing more info for the average range helps with better product picking.
It doesn't help that after size 5 or so they start saying 41+ lb or something. Like at that point just put what you analyzed the waist and hip size would be on the package. That "+" does not show the max range it goes to which they know.