Special tests can be used to determine if a child is right-handed, left-handed, or has equal control of both hands. The dominance of one of the hands can be determined after 4 years old.
The simplest tests for determining the leading hand are:
Brush your teeth
Get a book off the shelf
Put small toys in a box
Water the flowers
Stir the sand with a stick in the sandbox
Draw something with different hands
Throw and then catch a tennis ball
It is advisable that the child completes all tasks at ease, not suspecting that he is being checked, then the result will be correct.