[The phantasm of the perfect child and phantoms of eugenism].
The perfect child phantasm is a frequent problem in prenatal diagnosis. However, the definition of a perfect child is complex and is different from a couple to another. The chromosomal analysis of the fetus and amniocentesis are therefore frequently demanded by the parents. However, this could lead to foetal loss. The diminution of the number of unjustified amniocentesis is time consuming and requires a psychological approach. Dialogue, appropriate screening, ultrasound examination, and eventually late amniocentesis can avoid some pregnancy loss.