Not medieval, but gnostix1 submitted it, and it is very interesting:
 
An international team of archaeologists has unearthed what might be the earliest representation of childbirth in western art, they announced today.
Consisting of two images of a woman giving birth to a child, the intimate scene was found on a small fragment from a ceramic vessel that is more than 2,600 years old.
And more about amazing things discovered

Not medieval, but gnostix1 submitted it, and it is very interesting:

An international team of archaeologists has unearthed what might be the earliest representation of childbirth in western art, they announced today.

Consisting of two images of a woman giving birth to a child, the intimate scene was found on a small fragment from a ceramic vessel that is more than 2,600 years old.

And more about amazing things discovered