At approximately what month of age do children begin to display coordinated interactions with their age-mates and to imitate each others' actions and expressions in a play situation?

Question

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At around 18 months, children begin displaying coordinated interactions with their age-mates and imitating each other's actions and expressions in a play situation. This stage is referred to as the "toddler peer interaction phase."

At Approximately What Month of Age Do Children Begin to Display