因为妇产科护士坦承12年前将有钱中产阶级的Quesnoy家的男孩与下层阶级Groselle(北非移民)家的女孩掉包,现在Quesnoy不想交还女 儿,还想把儿子Momo买过来。Momo是在粗野恶劣的家庭环境中长大的早熟聪明圆滑小惯窃,但是他到了Quesnoy家却把他们弄得鸡犬不宁。 这是一部社会讽刺剧,对有钱阶级和没钱阶级同时进行炮轰。故事讲一个护士跟上司有染,曾故意将两个初生婴儿调包。12年后,上司的妻子去世,但他不愿跟情妇结婚,于是她大爆调包秘密,使两户贫富差距相当明显的家庭陷入各自的危机。富家愿意把自己孩子接回去,穷的那家则拼命敲诈;穷家女儿回到富家后,将很多以前的习惯带了过去;富家的女儿对自己亲身父母颇为好奇,但他们却并不想把她领回去。Two babies are switched at birth. When the mistake is discovered 12 years later, it leads to complications in the lives of both families. One family is affluent, with dutiful and (apparently) contented children. The other family is poor, with rambunctious (even delinquent) children, often hungry, but with lots of laughter in the house.