With a first birth, a woman naturally becomes a mother, and, in principle, a man becomes a father. The couple is no longer exactly a couple, and a certain art and a good dosage of energy will be necessary in order to exist as such. The couple will welcome the following children as if none had come before, with new gestures each time. Aldo Naouri shows how the birth of a child creates a new ever-changing dialogue and equilibrium within a couple.