Simple past tense and past participle of diaper.(verb)
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Use "diapered" in a sentence
"I diapered her, took her on long walks in her stroller, sometimes got up in the middle of the night to feed her."
"Attack of the 50-Foot Baby is a set of nesting, stacking cardboard boxes for your toddler to stack up and smash like a vengeful, pudgy, be-diapered goddess."
"The sooner the GOP goes extinct the better and instead of an elephant, the GOP logo should be a petulant, diapered and red faced 2 year old in a room of smashed toys."