Around the turn of the 20th century, Danish artist C.C.A. Christensen painted scenes of early Mormon history and Book of Mormon events. I highlighted another of his breastfeeding scenes in this post about the Mormon handcart pioneers.
This painting, Father Lehi Blesses His Children, shows a mother nursing her baby. She is in the center of the gathering, her shirt opened and her breast bared.
Here's a closeup: