The 5-year-olds begin their first day of school and love sparks between Halen and Harlo. Gia P emerges as queen bee among her girl peers.

Role playing romance becomes a contagious game. Jimmy and Eiryn handle being rejected in very different ways.

Madelyn finally stands up for herself after Gia goes too far. Quinton pushes past his fear of failure and takes an apple-balancing risk.

Experts examine the differences between girls and boys through the way they play, express themselves in relationships, and problem solve.