When your 3-year old has been playing in the car, check all car seat buckles and make sure they are still locked.
Today while driving down Maybank Highway I had to step on the brakes to prevent me from running a red light. After being at the light a few seconds, Banks started to whimper. I looked back to check on him and his face is pressed again the front passenger seat head rest! I pushed his seat back upright and called David to tell him our car seat was broken. After talking for about a minute, David asked me if it was buckled in. IT WASN'T! I panicked. I started brainstorming when we took Banks' seat out of the car last. I couldn't remember. And then I remembered that we let Hughes play in the car after church yesterday. He must have pressed the release button on the seatbelt holding Banks' seat in.
So, use this as a wake-up call - always check the seatbelts when you put your children in their seats.