Srila Prabhupada says...
These are not ordinary children, they are Vaikuntha children and we can give them chance to advance further in Krishna consciousness. That is very great responsiblity, do not neglect it or be confused. If you train a child in taking shelter of Krishna then that will become nature of child. Our children are the gift given by mercy of the Lord, they are delicate. Take care of them with Love and Devotion, by giving them Krishna Consciousness. Children are a blank slate. You