When buying a diaper bag, pick one that has lots of pockets and places to store individual items. Also, keep in mind that your diaper bag often becomes your purse, so find one large enough to keep your wallet, keys, glasses, cell phone, and other items you need for yourself.
It's a good idea to keep this bag packed with the following items at all times so if you need to leave the house in a hurry -- especially if you have to take baby to the doctor unexpectedly -- you'll be ready: