赤ん坊
あかんぼう · akanbou · JLPT N4 · noun
baby
👶 赤ん坊 = red (赤) + little boy (坊): a newborn is the little red one
Etymology: 赤 (aka) means red, and 坊 (bou) is an affectionate word for a little boy. Newborns have reddish skin, so Japanese calls a baby the little red one. The same idea gives 赤ちゃん (akachan).