You've probably come to rely on a well-stocked diaper bag. Some parents also stash an extra in the car ready for a whole day of emergencies: six to eight diapers, wipes and rash cream, a changing pad, one or two outfits, bottled water, formula if you use it, baby food, snacks, antiseptic spray, bandages, fever reducer/pain reliever, tweezers, a jacket or sweater for sudden weather changes, sunscreen, a sun hat, and bug repellent. If you have a spare, you'll be prepared for nearly everything, from getting stuck in traffic to an extra night of vacation.