ZERO TO THREE, in partnership with the Bezos Family Foundation, conducted a comprehensive research effort, including a series of in-home discussions and a large national parent survey with a diverse range of parents of children from birth to 5. The result of a large-scale research effort, the survey, conducted in October 2015, examines parenthood from the perspective of millennial and Generation X parents.
This link goes to the overview. From there you can find the full report.