Just like the title says. How do you stop your little monkeys from jumping in the bed/crib? H has started this routine every night and nap time where she holds onto the side of the crib and jumps. I'm worried that she is going to flip out one day but she thinks my threats are part of the game. I've taken toys, paci's, blankets, etc. short of spanking (because I hate spanking), but she will not listen and continues to jump.

Help!