- Stranger anxiety begins (can begin as early as 5.5 months; peaks between 9-12 months; and then again at 15-18 months)
- Shows specific preferences for certain people and toys (prefers primary caregiver to all others)
- May be fearful in some situations
- Tests parental responses to actions to behavior
- Repeats sounds or gestures for attention
- Extends arm or leg to help when being dressed
- Displays 2 or more emotions
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