| http://www.w3.org/ns/prov#value | - While children may progress at different rates, the following are some of the common milestones children may reach in this age group:Waves bye-bye and plays pat-a-cakeBy 18 months understands one-step questions and commands such as Where is the ball?By 24 months understands two-step questions and commands such as Go to your room and get your shoes.Understands object permanence (a hidden object
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