How infants learn and process language and emotions is important in helping to develop best parenting practices and early education programs, experts say.

WSJ: Wise Beyond Their Years: What Babies Really Know

Narvaez advocates a more responsive style of parenting that mirrors nurturing ancestral practices, including breastfeeding, frequent touch, soothing babies in distress, outdoor play and a wider community of caregivers.

CNN: Should babies be allowed to 'cry it out'?