How should I handle the fears in my kid's mind?

Gurudev Sri Sri - See, there isn't much fear in the mind of a child. And even if there is, you should calmly explain to them and ask them to do some chanting, such as 'Om Namaha Shivaya', or just say 'Jai Guru Dev', and all the fear drops off. See, when you have some moral support then there is no fear. This is why chanting mantras, doing Pranayama can offer strong support to dispel away all fears one may have. Mantras are the greatest source of strength and support.