Remember how everyone told you to rest up before your baby was born? Yeah, well, the same advice holds true for raising a toddler. The fact is, once they're up and running, toddlers pretty much never. Stop. Moving. Because of this newfound independence and their boundless energy (if only you had half as much!), the pre-preschool set will sometimes put up a serious fuss when it's time to sit down in the car seat or stroller. But all this movement does have an upside: It helps tire them out for the mid-day nap.