19. Keep Them Out Of Your Bed
Unless you intend to co-sleep and are comfortable with the idea of a family bed (which are completely valid choices), it's best to insist that your child sleep all night in their own bed. It's hard when that sweet little voice says, "I go night-night with Mommy." However, if you cave even once, your kid will learn that this is an option, and it is an awfully difficult habit to break.