How do you know it's time?

The first time the Bug's car seat toppled over in the car I thought it was a fluke. But when it happened twice more today, I decided that she had officially outgrown her "baby" seat and needed an upgrade. I immediately set the Hubs onto researching car seats on Consumer Reports. He loves tasks like this and jumped at the chance to not only research, but purchase the seat if her could find one that met all criteria. We are now the proud owners of this topple-proof car seat.