"The Nursing Madonna, Virgo Lactans, or Madonna Lactans, is an iconography of the Madonna and Child in which the Virgin Mary is shown breastfeeding the infant ...
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Jesus. In Italian it is called the Madonna del Latte ("Madonna of the milk"). It was a common type in painting until the change in atmosphere after the Council of Trent, after which it was rather discouraged by the church, at least in public contexts, on grounds of propriety.
The depiction is mentioned by Pope Gregory the Great, and a mosaic depiction probably of the 12th century is on the facade of Santa Maria in Trastevere in Rome, though few other examples survive from before the late Middle Ages. It continued to be found in Orthodox icons (as Galaktotrophousa in Greek, Mlekopitatelnitsa in Russian), especially in Russia." - (en.wikipedia.org 09.11.2021)