The Diaper changing Charm or Nappy changing Charm in Britian, is a charm used to change diapers/nappies.
To cast the spell, wave a wand over the baby while they lay on a changing table. The magic will levitate nearby objects as long as the caster concentrates otherwise the spell will abruptly end. The spell only takes a few minutes and the baby is successfully changed.
Baby Oscar uses this spell on himself whenever he needs changing.