4 years ago, experts in all areas of paediatrics decided to work together to establish a joint congress. Our congress will not be a simple juxtaposition of the themes brought by these different areas; rather, there will be exchanges between all partners, taking place around a transversal programme developed by a common scientific council. The richness and diversity of this programme illustrates these collective efforts. Our congress will propose 60 Round Tables, 25 Workshops and 18 new Step-by-Steps, on themes common to several companies. Work focusing on the youngest patients, undertaken in recent years, will continue with oral communication sessions, e-posters, research awards and the second edition of the simulation contest.