Everything you need to know about how your 3-year-old is developing, from physical and cognitive milestones ... motor skills ...

at about age 5, children can be expected to display most of the following social and cognitive skills, although each child develops differently and may achieve some milestones earlier or later ...

The World Health Organization uses the measure to determine whether children are meeting age-appropriate milestones in social and cognitive development. This approach led to the identification of ...