" There are many different ways of approaching parenting as there are cultures. However, in non-industrialized cultures, the similarities are also striking. Extended nursing, co-sleeping, carrying the baby in close physical contact, responding promptly to cries or distress, never leaving a baby alone, are all virtually universal in traditional societies that have not become overly "westernized". "

― , Diaper Free: The Gentle Wisdom of Natural Infant Hygiene