http://www.slate.com/articles/health_and_science/human_natur...
It is almost in the same line of thinking that infants are not capable of feeling pain and why some operations on them were done without anesthesia:
http://www.nytimes.com/1987/12/17/opinion/l-why-infant-surge...
I believe some operations on infants are still being done without it:
http://gizmodo.com/why-are-so-many-newborns-still-being-deni...
"to this day, many procedures are performed on newborns without the benefit of analgesics. That’s largely because of an enduring misconception in the medical community that newborns don’t feel pain like adults."
While that sentiment is certainly a part of medical history, there's a good reason why many procedures on infants are still carried out without anesthesia today. Infants are fragile and most forms of pain relief we use on adults are simply too dangerous for infants. Any anesthesiologist will weigh the benefits vs. the risks for each particular procedure and for infants that ratio is considerably different compared to adults.
"Key medical objections to infant anesthesia - that it was (a) unnecessary and (b) dangerous - were resolved by the brilliant research of Kanwal Anand and colleagues at Oxford from 1985 to 1987. Making precise measurements of infant reactions to surgery, they proved that the babies experienced pain, needed and tolerated anesthesia well, and had probably been dying of metabolic and endocrine shock following unanesthetized operations."
Source: http://www.nocirc.org/symposia/second/chamberlain.html
[1] http://www.webmd.com/parenting/baby/news/20120820/anesthesia...
[2] https://www.fda.gov/ForConsumers/ConsumerUpdates/ucm364078.h...
I don't think anyone's seriously suggesting simply forgoing anesthesia in life threatening cases, but people might want to rethink a routine tonsillectomy or some dental work.