The National Children's Study has launched at the Children’s Hospital of Philadelphia (CHOP) Study Center.
- February 26, 2009 — The CHOP Study Center Opens Montgomery County Field Office in Norristown.
- April 22, 2009 — The Study is officially launched in Montgomery County with a public event held at the Montgomery County Courthouse.
- April 25, 2009 — Families living in eligible areas of Montgomery County are invited to join the Study.