From the very beginning, children should be trained up in this line of Krishna Consciousness. That is the responsibility actually, father's, mother's affection.
But the father-mother do not know what is the aim of life. Neither they are trained up. How they can train up their children?
But here is the prescription how to train up. So in this age, although it is a very difficult task, at least if we teach our children to chant Hare Krishna maha-mantra, then everything is possible. That is the facility of this age.
He'll be gradually trained up to the highest perfection. Chaitanya Mahaprabhu's benediction is there: yaha haite sarva siddhi haibe tomara. Simply by chanting Hare Krishna mantra, you'll get all perfection of life.
That is a special concession of this age. Just like these children were dancing and chanting.
And it is the duty of the parents to train the children in such a way they get liberty in this very life.
Father, mother, they should think of their innocent children, that "This boy, this child has come to us. Now let us train him in such a way that he will get liberty, no more birth and death." This is real responsibility of father and mother.