Apparently 20% of modern babies experience 'colic' "When crying lasts for longer than about three hours a day and is not caused by a medical problem", and these babies show signs of gastrointestinal inflammation. Certain probiotics caused these babies to cry less. Gut inflammation of course makes me suspect grains and excess fructose as culprits.
So I was wondering what amount of baby crying is normal, given a fully nourishing and non-toxic diet? It seems odd to me that such constant pain and suffering would be the default nature of humans, for any stage of their development. I also wonder if such frequent negative affect has any long-term influence on personality/brain development.
I recall a video overviewing some modern, traditional-living humans, claiming that the babies these mothers carried on their backs hardly ever made a peep, but i couldn't find a link for that.