I go outside multiple times daily and would never even think of planning a camping trip with a 9-week-old.
I would be shocked if someone even suggested it, no matter how many times they go outside.
They aren't Nancy-boys over there.
Years ago there was a young couple and their infant daughter who were hiking Mt. Hood when they were surprised by a late snowstorm. The couple, ardent outdoor types who understood survival, made a snow cave and hunkered down to await rescue.
The young mother breast fed her baby, then later died before the three were rescued. Doctors said if the young mother hadn’t breastfed she wouldn’t have died.
So yes, there are people who take recently born babies out into the wilderness.