Pregnant patients for whom amniocentesis will be performed as part of the prenatal management of CDH confirmed by fetal ultrasound will be approached fot inclusion in the study. The indication of amniocentesis will be indicated according to the usual standards of care. Briefly, the study will not involve any additional invasive procedure. In our study, amniocentesis will be indicated during the conventional management of these patients. The needs of our research will not lead to additional amniocenteses, but simply an increase in the volume of amniotic fluid collected. An additional volume of 5 ml will be sampled for volumes usually taken from 20 to 30 ml. This volume of sampling will have a very limited impact on maternal and fetal well-being. An analysis of the proteom of the amniotic fluid of the patients will be carried out. The relative amounts of proteins and peptides contained in the amniotic fluid will be analyzed to explore variations in proteomic profile that may reflect different clinical gravity in terms of further evolution. The usual management of the patients and their children will not be modified by the procedures related to the research.