Every time you wear a nappy, you will feel and act like a baby or toddler. This is the basic suggestion I've been using myself. It uses the British-english words "nappy" and "dummy" (though I'm happy to do an alternate version with "diaper" and "pacifier" if people want). It is designed to follow on from "pacifier induction" (either my version, or the ones by hellion0), but this isn't essential. For best results, listen to pacifier induction 1 and 3 on alternate days for a week or so, then listen to this file every day for a week before you try triggering yourself. Sorry about the poor sound quality, this was recorded on my phone as I'm currently homeless.