https://www.hhs.gov/sites/default/files/decision-memo-adopting-revised-childhood-adolescent-immunization-schedule.pdf
https://www.hhs.gov/sites/default/files/assessment-of-the-us-childhood-and-adolescent-immunization-schedule-compared-to-other-countries.pdf
View the fact sheet here.
https://www.hhs.gov/press-room/fact-sheet-cdc-childhood-immunization-recommendations.html