Between three and six months of age, the period of peak face-to-face play, an infant is exposed to tens of thousands of examples of facial emotions. In interactions with mother, a child mirrors mother's expression, and she, in turn, imitates the infant. The table below lists the infant's repertoire of facial emotions.
|Interest||Brows knit or raised, mouth rounded, lips pursed||Present at Birth|
|Distress||Eyes closed tightly, mouth square and angular (as in anger)||Present at Birth|
|Disgust||Nose wrinkled, upper lip elevated, tongue protruded||Present at Birth|
|Social smile||Corners of mouth raised, cheeks lifted, eyes twinkle; neonatal "half smile" and early startle may be precursors||4 to 6 weeks|
|Anger||Brows together and drawn downward, eyes set, mouth square||3 to 4 months|
|Sadness||Inner corners of brows raised, mouth turns down in corners, pout||3 to 4 months|
|Surprise||Brows raised, eyes widened, oval-shaped mouth||3 to 4 months|
|Fear||Brows level but drawn in and up, eyes widened, mouth retracted||5-7 weeks|
Source: Drawn from work of Carroll Izard as reported by Trotter (1983).
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