To wrap a baby up tightly in a cloth, with its arms held gently against its body, so that it stays warm and feels safe. This is a specific, practical word, not just 'to wrap'. The point of swaddling is the tightness: a newborn's arms jerk on their own while it sleeps and wake it up, so holding the arms in helps the baby sleep. Nurses in hospitals do it, and new parents are often taught how. The cloth itself is a swaddle or a swaddling blanket, and you will see 'swaddle' used as a noun in baby shops for the ready-made kind with velcro. In older English, especially in the Christmas story people hear read aloud, you meet 'swaddling clothes' — the strips of cloth a baby was wound in long ago. Outside babies, writers sometimes use it for anything wrapped up tight and close — 'swaddled in scarves' — and that is a warm, gentle picture. Though actually, doctors now argue about it: wrapped too tight around the legs it can harm a baby's hips, and a swaddled baby must be put on its back. So it is taught more carefully than it used to be.

把嬰兒包起來、包巾包好（台灣說「包包巾」「打包」小孩）；那塊布叫「包巾」。注意不是一般的「包裹」(wrap)，重點在包得緊、把手臂固定住。