Maya played peek-a-boo with her 3-month-old nephew and whene…
Maya played peek-a-boo with her 3-month-old nephew and whenever she hid her face and then reappeared, he would laugh. When he was 9 months old, Maya played peek-a-boo with him again. This time he laughed and enjoyed the game, trying to uncover her face with his hands by pulling on the blanket. Maya’s 9-month-old nephew has begun to develop _________.
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