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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.
Here are some tips to coax a grin: 1  Choose a period when your baby is relaxed. 2  Take your baby in your arms with her face very close to yours.  Smile widely at her and offer a warm hello in that sing-song pitch parents do so well.