My youngest daughter, Dylan, turns 3 today. For her birthday, we are retiring her crib and tonight she moves into her big girl toddler bed. It's an exciting day in the Riffert house. Neither of my girls ever climbed out of their cribs at night, so we kept them in there as long as possible. I liked knowing (with a fair degree of certainty) that they were contained and safe. They are fiercely independent little girls and, to me, there was a sense of comfort knowing they wouldn't get out of …