Stick your face right up to the newborn baby and go like this and stick your tongue out.

把你的脸凑到婴儿的面前,像这样对婴儿做鬼脸,把你的舌头伸出来

耶鲁公开课 - 心理学导论课程节选

And Meltzoff finds that babies more often than not stick their tongues out back, suggesting some sort of social connection from one person to another, and then later on babies are mimics.

迈尔左夫发现,婴儿往往会把舌头伸出来再缩回去,表明了人与人之间的某种社会联系,也说明了婴儿是模仿者

耶鲁公开课 - 心理学导论课程节选