I have a book, titled “American Human Development Report 2008-2009.” A section covers Age 0-5. By age 3, vocabulary acquisition (number of words a child knows) can be double that of less fortunate children. Lead; a friend’s baby tested positive in 2008 as did another friend who lived in a basement apartment for 6+ years as an adult. Network of Social Support- should be large and diverse, (family, neighbors, neighborhood, co-workers, etc.)
I have a book, titled “American Human Development Report 2008-2009.” A section covers Age 0-5. By age 3, vocabulary acquisition (number of words a child knows) can be double that of less fortunate children. Lead; a friend’s baby tested positive in 2008 as did another friend who lived in a basement apartment for 6+ years as an adult. Network of Social Support- should be large and diverse, (family, neighbors, neighborhood, co-workers, etc.)
You can get to the root cause quicker by looking at average IQ scores from around the world and across time.