| http://www.w3.org/ns/prov#value | - ets) by 11-20 months.He should be able to follow a two step command without a gesture by 14-21 months.Two word combinations or sentences are used by 18-22 months and can include phrases like 'Want milk', 'More juice', etc.A vocabulary spurt leading to a 50+ word vocabulary occurs by 16-24 months.Parents are usually the first ones to think that there is a problem with their child's motor, social, a
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