Breastfeeding in a Capitalist Society by Rebecca Blood.
I’ll just add that modern western culture is the only one not to find long-term breastfeeding normal, and that Nestlé et al. didn’t put baby food on the market that long ago.
It has also been shown that breastfed babies are exposed to a much wider variety of flavors (mother’s food influencing the taste of milk) than formula-fed babies.