How do I get my 13 month old to sit in her car seat?

is not the only form of discipline. Time-outs work just fine and aren't any fun for the child. Bribing her won't teach her anything but that you're a pushover. They are Never too young to learn, children are intelligent. Start using discipline in the house and it will run over to everything else. But of all things, you're the boss, stop bribing your child.