What if crawling is unnecessary? There are cultures in which babies are not allowed to crawl and are never given floor time. What effect does that have on their development?
Why is it that some mammals can just leave their babies in a den or nest, while others carry theirs around (or have them cling on) through out the day?
Learn more about Alma Gottlieb’s book “The Afterlife is Where We Come From” on the culture of infancy involving reincarnation and carrying among the Beng.