子こ供どもは３さん歳さいまでに一いっ生しょう分ぶんの親おや孝こう行こうをする

expression

children pay back their debt to their parents in full by age 3 (through their cuteness)

Proverb expressing that a child's adorable behavior up to age 3 is so precious it repays all the care they receive.

• 「子こ供どもは３歳さいまでに一いっ生しょう分ぶんの親おや孝こう行こうをする」と言いわれるように、幼おさない子この笑え顔がおは何なによりの贈おくり物ものだ。

  As the saying goes, 'A child repays a lifetime of filial piety by age three,' and a young child's smile is the greatest gift.