It may be hard to imagine that the little one whose diapers you change will ever be old enough to walk, let alone walk off to college (gulp!). Our Baby Milestone Tracker will put it all in perspective. Just enter a few key pieces of information, and you'll get a list of when to expect important infant milestones, as well as bigger-kid milestones. Find out how old your baby will be when he starts walking, loses a first tooth, and gets a driver's license -- and how old you and your partner will be, too! The baby milestone quiz will take you all the way to college graduation. You'll be blown away just thinking about it.