The director Christoph Schaub cast twins for the role of the baby (Mahaut) to be able to "change the actress" if one of them was tired or cried.
Nobody on the set wanted to get the baby crying for one of the scenes. But suddenly the mother of the babies had an idea: the babies hate the sound of the vacuum-cleaner. So director Christoph Schaub began to clean the floor. The baby cried.