noun
diaper; nappy
Standard word for a baby's or adult's diaper. The polite prefix お is part of the word.
赤ちゃんのおむつを替えましょう。
Let's change the baby's diaper.
おむつが濡れているみたい。
It seems the diaper is wet.
Standard kana spelling; the word is usually written in kana.
Katakana spelling, common in product names and informal writing.
Rare kanji form; the characters are not commonly used.
おしめ is a more traditional or old-fashioned word for diaper, often used for cloth diapers. おむつ is the modern, general term.
The origin is uncertain, but it may be related to the word むつき (襁褓), an old term for diaper, with the honorific prefix お added.