My son now is 17++ month old, when I ask him question and telling him something, most of the time, he did not give me reaction. He did not know to move his head to say yes/no, but he know to give other reaction to show he dont want something and he know to ask people to do something for him. When he is 9 month old, he use to wave hand to people, but now he refuse, even flying kiss also dont know how. Is this a big problem or is normal??? Is it development for a child is different among each child???
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