在这部十二岁小妈妈片中,１２岁的玛蒂尔德在家中排行老大，底下有五个弟弟妹妹。为了分担家庭的重负，玛蒂尔德放弃了上学，整天在家帮助妈妈带孩子，操持家务，成为名副其实的全职小妈妈。生长在这样的家庭，玛蒂却从不叫苦，直到有一天，游泳教练的出现重新唤起了她对正常生活的向往。为了实现游泳冠军的梦想，玛蒂尔德勇敢地反抗她深爱的母亲.
Mathilde is the eldest child of a family of 6 children.She runs all the day and plays the role of the second mother on the same level as her mother Fabienne.One day a swimming coach observes her in the swimming pool and proposes her to be member of the swimming team.Her mother doesn't understand that Mathilde must live her youth as an adolescent and therefore she doesn't agree agree that Mathilde belongs to the swimming team.
