Well, guess what I just saw recently?
I decided to do a little experimenting with cloth diapers for this picture, seeing as I'm pretty sure disposable diapers weren't invented yet during the time "Moana" takes place.
"Aside from her secret desires to voyage out into the ocean, Moana had something else she wished she could do, except she was the only one who knew about this secret. She wished she could return to the time when she was just a baby.
She had found a beach on her island that was isolated from the rest of the village. She decided to make this her secret baby-play spot. She would bring a bag of assorted baby things (mainly diapers) down to the beach and spend an hour or two revisiting her babyhood.
Moana loved the thickness of the diapers she brought because they kept her legs far apart, forcing her to waddle around on the sand. She'd sit at the ocean's edge and allow the waves to caress her diaper, soaking it in seawater, causing it to sag. Of course, she'd wet the diapers herself too, as well as messing in them. She'd sit in the sand and rock back and forth, squishing around in her wet diaper. Then, she'd take a nap in the sun, and on occasion, even pleasure herself in her diaper.
When she was done playing baby for the day, she'd change out of her diaper, clean herself off, wash the diaper and leave it out to dry, get her regular clothes back on, and head back to the village."