Trucker: My son was born in 1966 and we were too poor for disposable diapers, so I got pretty good with a diaper pin! I'm not sure, but there may have been two sizes of cloth diapers. They did wear out, and we may have replaced with the larger size, but maybe I'm (excuse the pun) all wet.
When we used disposables, there were size choices, sometimes by age in months or designation: Newborn, 6 months, toddler, etc, or by weight.
Grandchildren taught me it had added by male and female, and sizes had changed, but they were consistent across bands.
I'm lucky. My incontinence has improved to where I'm using pads. That could change, of course.
The links to these photos were okay, and i have a hard time understanding why the sizes are so "off".
Can you afford to experiment with brands or call the company? I gather that sometimes they will send samples.