Korean advertising agency Diamond Ogilvy created ads for Good-Nites modeled after David Beckham's last Armani Underwear campaign. Diamond Ogilvy explains:
“Children who are no longer using diapers can wear Good-Nites to prevent bed wetting. We show Good-Nites being worn as fashionable underwear to show children that Good-Nites aren’t diapers.”
A baby in the diaper phase clearly wouldn't have the coordination and balance required to manage a large rope like that.