As Paul notes  " When I was a child I thought as a child " etc.  Even Jesus is said to have grown in wisdom , age and grace . 
Pius X  wanted 5 year old children admitted to Communion with the reception of Reconciliation a few years later .  Francis reminds us we are not dealing in concepts .  We are not devoted to ideas .  The child accepts according to the way a religious truth is presented to her / him .
The adult is far more than a teacher .  Rather it is a relationship of a person to the person of the child about the person of Jesus  .
We then leave the rest up to God's Action in the child and The Lord does not fail to keep his promises  .  
If memory serves your post spoke about how instinctive children are at avoiding danger  .That is why I rattled on so in my comment  .  
Some children have been known to recite the pledge of allegiance saying "  for Richard Stans" ,
not to mention in the Hail Mary. ..
blessed art thou  a monk swimming .   
Childhood has its charms.