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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.
1 If available, use a probe cover with your thermometer.  Place the thermometer under the side of your child's tongue until the thermometer beeps. Tell your child to keep lips firmly closed but not to bite the thermometer. It is often helpful to have the child hum to help pass the time and keep the mouth shut.