You're right, of course!
Prior to the widespread availability of baby formula, no baby was ever malnourished, or had a cow's milk allergy, or was troubled with similar attendant difficulties, and no woman had difficulty producing enough breastmilk.
/mordant sarcasm
Regards,
My mother had me and my brothers right before and after WW2. So far as I know she breastfed us for a while at least until we started solid food. Incidentally, nice thing about exclusive breast feeding, the poop does not stink very much. Big change in smell with other food. My mom, born 1907 in NJ near the Hudson River said she used to see poor immigrant women sitting on their porches chewing food, and then feeding that to their babies. My father born 1909 was given raw milk from a typhoid infected cow. He was one of 6 children of over 60 babies who did NOT die. My grandma held his butt cheeks together so he did not poop out his guts. She got sick too and lost weight down to the 70 pounds area. We have no idea how bad it can get living in comfortable suburbs.
My first boy was born 9 pounds and was hungry all the time. I was nursing him 10 times a day and got very sore. Another mother said, nurse 10 minutes on each side, then give him a pacifier. That really helped. When he was one month he weighed 14 lbs., the weight of the average 6 month old. By then he was down to 6 feedings, and soon thereafter 4 a day. He grew to 6’1” and spent the past 20 years in Special Forces. My other son spent his first week in an incubator, was a month early, weighed 7 lbs. I pumped until I got him home and he nursed until 2 1/2. When he was around 2 he would object to being put in his pajamas. I would lie there with breast exposed and he would glare at me and kick at me. Eventually he would take the breast and after a while he would relax and soon be patting me with one hand, We talked about this recently. He said that experience taught him forgivenesss. He actually remembers lying there angry, but wanting the milk. To get it he had to forgive me for forcing him into pajamas. He is a really laid back guy.