Human babies can produce “Witch’s Milk” shortly after their birth. It odd, but true, and not something to be alarmed about.

While a baby develops in the womb he/she is exposed to a lot of estrogen. Estrogen causes the Mother's breasts to swell and get ready to produce milk for the baby. The baby, being directly attached to its Mother, also has estrogen in its body. Sometimes this causes the baby's breasts to swell and after birth they can leak what looks like milk. Its just short term, gone in a couple of weeks as the estrogen leaves the baby.

Of course, in the Middle Ages, people did not understand how or why this happened. It seemed to them witches must cause this. Intending to use the milk as a particular treat for their familiars, demons, or anything else that looked a little suspicious. Some parents created baby sized rag dolls to sleep in the crib with the baby, hoping to trick the Witches.

Which makes me wonder... were these the first rag dolls? It seems possible.