The most important parenting lesson there is that time flies. Every second, every minute, every hour is the only moment you have with them at that age. As a human being and as a parent, you can't help but wish for the future. You've heard that you only get 18 summers with your kids, but actually you only get one. I had a little medallion made to me of this very idea. Because i want to remember that this isn't an ordinary moment.