The unit of pediatric endocrinology takes care of children and adolescents with disorders of growth, puberty, thyroid, adrenal, pituitary or gonadal function, and also anomalies of the calcium metabolism. We have a multidisciplinary approach, including the paediatrician and the other specialists. We analyse our results locally, but also at the national and international levels. Through special patients, we try to understand different concepts, at the level of physiology or at the molecular level. A few examples will be described here and can be found in more detail in the bibliography.