Interesting thought about child development: (related to breastfeeding because how and where babies sleep is totally related to how easy it is to breastfeed)

Sometimes, child development experts in the United States regard adults in other communities as irresponsible if young children handle dangerous materials or tend infants, because they assume that young children can’t do such things. However middle-class U.S. families also expect children to do some things that are seen as inappropriate or even dangerous in other places, such as sleeping by themselves from the first months of life, engaging in school-like discourse or beginning to learn to read in the toddler years.

From The Cultural Nature of Human Development by Barbara Rogoff (2003, p.170)
I also like the book, Our Babies, Our Selves by Meredith Small for reading more about how different cultures parent babies.