How do you know that you have an enlightened child?
Children are born enlightened. Then we drag them into our misery, because we’re incapable of loving them - for example, by trying to ascertain whether they’re enlightened or not. Or trying to teach them to be nice. We are afraid of their purity and freedom, so we want them to be scared and obedient like we are. Then by the time of puberty they already hate us and we hate them back. Welcome to Samsara, child!