Because kids these ages are sensitive to everything, you need to do several things to deal with this, and to use it for your advantage!
Know each kid's name, the family history, their grade in school, etc. IN SHORT, KNOW EVERYTHING YOU CAN ABOUT THE INDIVIDUAL KID!
Remember, since kids these ages relate to everything in concrete terms, you represent God, and His love to the kid!
Use the kid's name whenever you talk to them. Don't refer to them using some sort of "catch all" type "non-name," like buddy, friend, etc.
When a kid's talking to you, give them your undivided attention! I know that this is hard when you constantly have other kids vying for your attention, but the original kid'll appreciate you trying.
As I already said, but it bears repeating, bend down to their level, and stop what you're doing!
When talking back to them, answer appropriately, always using your "new learned" speaking a kid's language. AND ALWAYS SHOW THAT YOU CARE!
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Characteristics of Prekindergartners-4