A baby is born with approximately 100 billion neurons and during their everyday activities the synapses are developed. Activity, interaction and movement are like food for an infant’s brain, helping it to develop.
Not all babies crawl. Some babies will shuffle on their bottoms or commando crawl to help them get from a to b.
The Au people of Papua, New Guinea have babies which don’t crawl. They move around on their bottoms, propelling themselves with their hands. Tracer, associate professor of anthropology and director of the Program in Health and Behavioral Sciences at the University of Colorado at Denver has carried out research among the Au people. Among the Au people, Tracer found babies in their first year of life were carried during 90 percent of their waking hours, usually by a mother, father or sibling.