Every March, the Sainte-Colette parish of Buttes-Chaumont organizes its traditional annual pilgrimage "for couples expecting a child" over more than 6 km through a maze of streets in the north of the capital. “We have exhausted everything, so we turn to God.

Even if we didn't wait until we had exhausted everything to pray, of course,” says a young woman, a fervent Catholic, accompanied by her husband.“Demographic rearmament”: through Paris, the annual pilgrimage of infertile couples.