He arrives with his mother and grandmother, his eyes wide open and expressive, nibbling on a piece of bread. As we move through the building to go up to the second floor of the BBRC Alzheimer's Research Centre, of the Pasqual Maragall Foundation, he looks around him in a serious manner. He can hardly understand Nilo, a beautiful 15-month-old boy, who today will be the protagonist of an experiment that aims to change what science knows about women's mental health during a crucial and vulnerable stage of their lives, pregnancy and postpartum.