In the twelve years of the Red Chapel at Nashotah House, I saw some remarkable things. We were watching the formation of liturgical Christians. Children there willingly and fully participated in the liturgy. It became their own experience, not something derivative. They claimed it as their own and identified with it.
Children are startlingly direct in engaging signs.
I knew one child, an extraordinary child named Sean, just two in his father's arms. As a rule I don't give the sacrament to a child until the parents approve, so I blessed Sean and afterwards talked to his parents. The next Sunday, we made Sean a communicant. Children experience something on a deep level, not heavy-handed or didactic but very direct, from observing adults. Adults' reactions are profoundly important.