PSA

Seatbelts are your friends....
They keep you inside the vehicle so you don't go flying out.
They also should help keep your body in at least the correct general area of the car.
They SHOULD be used with car seats. Car seats are not meant to just be tossed in the back seat of the car unrestrained with a baby in them. That is NOT the idea.
It is actually against the law for you to not wear your seatbelt or to have your child(ren) properly restrained.

I would like to say, while I have heard NUMEROUS stories of "well, my cousin's best friend's boyfriend's brother's half-sister said that she would have died if she'd had her seatbelt on in that wreck" as an excuse to not wear a seatbelt.... I have seen MANY people either die or be badly mangled due to not wearing their seatbelt. How many have I seen die due to wearing a seatbelt? One, and she wouldn't have made it out of the car anyway even without a seatbelt due to the mechanism of her injury.