[At last dyad becomes triad? An evolution of the concept of father and his participation during birth of child].

The role of the father during the pregnancy and in the birth of his baby has changed through the times. Nowadays, there are studies that show that this support to the mother during pregnancy, labour and in the very first moments of the baby's life can have a significant influence in the establishment and development of the mom-dad-baby triad. This article intends to show this evolution and its consequences on the strenghtening of emotional relations within the triad.