The Visitation of Mary (pregnant with little Jesus), to her older cousin Elizabeth (pregnant with the future Joan the Baptist), is one of the most represented sacred scene of the Bible among the Renaissance artists.
From our artistic viewpoint, it has the great advantage of representing TWO pregnant women! One can see even a third pregnant person in the painting by Ghirlandaio.
Beyond Italian Renaissance, there were Visitations from Hungary, Spain, France, Cyprus (Byzantine art), and many others. Colour codes of the clothes are relatively well respected. The foetuses are sometimes represented as "mandorles" or in transparency over the bellies. After the Council of Trente, 1563, representations of the foetus in utero were forbidden
The painting on the side, titled La Visitacion de la Virgen a Santa Isabel, is from Escuala Castellana but has no know author nor date. From the Museo Lazaro Galdiano, Madrid, Spain.