<p>Children grow up very fast. Before long, the almost indistinguishable speck in your womb is going to be flying down a hill on a bike with their hands in the air and driving down the interstate in your new car. Before you know it, you'll be telling them good-bye as they start college, crossing your fingers and hoping for the best. You'll never have the opportunity to nurture them again as you do right now, when they're safely inside you tucked ...