U.S. Babies Are More Social Than Other Kids

Babies born in the United States are more social and impulsive than those from some other countries, a new study has found. They're also, according to their moms, more likely to enjoy highly stimulating activities, less likely to be unhappy or angry and are easier to comfort when they do get upset.

Researchers from three countries compared kids from the U.S. with those from Chile, South Korea and Poland.