This is part of a larger problem. Children are weak and lack the power of will. Their vital habits emerge from the earth's subconscient which is the reservoir of all our bad habits and impulses. This is why Sri Aurobindo & The Mother were doing Sadhana for cleaning up the Earth's subconscient by bringing down the Supramental Light. As for us, we must transform ourselves so that we can radiate the vibrations that will positively affect those around us.