Hi, My son can't Talk and he's now 4. When he's asking for something, he demonstrate it . But he can say mommy, And yellow sometimes car and daddy. He can also say ama short for grandma when he's calling here grandmother. He can draw lines and circle. And play along with other kids. But I notice that everytime I call him especially when he's focus on what he's doing, it seems like he can't hear me. But he has an eye contact.