Met Museum. [They had a large exhibition of maiolica and not just those for use after childbirth.]
Open Science Museum. Two ceramic plates with childbirth designs. JSTOR/ARTSTOR. [there are many examples of these dish sets not listed as maiolica in collections all over the world]
Piccolplasso, Cipriano. 1557. Li Tre Libri della’arte Vasaio. Victoria and Albert Museum, MSL/1861/7446.
Princeton University Museum of Art.
Sam Fogg Ltd. A Maiolica Dish for use during childbirth. [They have a video and a pdf with an excellent overview of maiolica.}
Victoria and Albert Museum. [the painted wood bowl example.]