Until where can one go up in the observation of the birth of the life? This film invites us to a fantastic voyage to the interior of our bodies, to observe, with humour, the birth of the life in the whole of its phases: since the search of the partner, while passing by the sex act, fecundation, the growth of egg and the foetus, until the arrival in the world. Thanks to last technologies of medical imagery and microcinematography, this film approaches with more close to the "miracle of the life". The explanations of the best world experts on the various topics approached are punctuated film extracts or publicities which are as many humorous illustrating of the situations or of the scientific theories.