https://www.sciencedirect.com/science/article/pii/S152659001...> textbooks at the time taught that [open heart] surgery [...] ‘‘could be safely accomplished with only oxygen and a paralytic’’ 69(p.580) when performed on infants.
Textbooks isn't "some doctors errorneously believed", it is what most doctors believed, taught and practiced.
> infant surgery routinely conducted with no or minimal anesthesia well into the 1980s
"Routinely" isn't a few isolated cases, that's the word for "this is the usual thing to do".
https://pubmed.ncbi.nlm.nih.gov/20608214/
> The study by McGraw (1941), although badly designed, convinced the vast majority of clinicians that infants do not feel pain and do not require analgesia. This theory, reinforced by the fear of using opioids in young children, dominated medical thinking for more than 30 years.
"Vast majority" and "dominated" also doesn't sound like just "some cases".
https://www.nytimes.com/1987/12/17/opinion/l-why-infant-surg...
> surveys of medical professionals indicate that as recently as 1986 infants as old as 15 months were receiving no anesthesia during surgery at most American hospitals.
We can discuss the definition of "kid" and "newborn", but I would no longer call them "newborn" when they start walking. Also "most American hospitals" means the practice was very widespread even in 1986.
I think the whole situation is one of the medical community failing to recognize and admit their own mistakes. Instead, the obvious barbarism of the whole situation is played down, diminished and belittled. Thereby protecting their own feelings and standing at the cost of the victims' right to the truth. And thereby paving the way for a repetition of such gruesome mistakes. At which point I would argue, it might even be a little callousness or even intent...