Children are worshipers, and their lives are shaped and controlled by whatever they worship.  That means that every moment is a God moment.  In every moment, a child is accepting his role as a creature and living in worshipful obedience to God, or he is exchanging God for some aspect of the created world he is living to get.  Children don’t typically think of themselves this way (nor do their parents!), so they need us to faithfully point out to them the covenantal nature of their actions.  There is no more important piece of the Bible’s job description for parents.