circumcisons were done without any kind of pain control on the basis that infants were not well enough developed to feel pain.
Newborns do feel pain.
Parents don't have to be told that, and many pediatricians don't either. But the contrary belief - that the smallest babies are such primitive organisms that they are oblivious to pain - has persisted for decades among many physicians who have routinely operated on these children with little or no anesthesia.
https://www.nytimes.com/1987/11/24/science/infants-sense-of-pain-is-recognized-finally.html
When I was pregnant in 1987, and deciding about circumcision if I had a male child, the idea that infants don't feel pain was still as common as not.