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One possibility is that it is a learned behavior that evolved from kiss feeding, the process by which mothers in some cultures feed their babies by passing masticated food from mouth-to-mouth. However, there are some contemporary indigenous cultures which still practice kiss feeding, but not social or erotic kissing.
When I see babies with chapped lips, my first question is whether or not they use pacifiers or take a baby bottle to bed. These should be avoided -- the constant moisture and saliva around the mouth leads to chapping and skin rashes. The same goes for lip licking and chewing bubble gum -- habits I often see in school-age children.