At the ripe age of four, the sextuplets wonder where they came from and how they got a start in this big world. Jon and Kate decide to show them the Neonatal Intensive Care Unit (NICU) where they spent their first several weeks. They meet the doctors and nurses who were there on their birthday. They'll even get to have a sleepover in the condo that Mommy and Daddy lived in during their stay in the NICU!