They were difficult to keep clean, and infants surely must have found
them uncomfortable, but for almost 2000 years, pottery nursers
(complete with pottery nipples) were used for feeding babies. Mothers
had no choice--glass was unknown at first, then later only a
curiosity.
Anonymous. Feeding Baby through the Ages. Today's Health (US magazine
for general readership). April 1964.
(There is not one word on breastfeeding in this article called
"Feeding Baby through the Ages")
Jack Newman, MD, FRCPC