Left or Right Handed?

Hand dominance and hand preference are terms that refer to a person’s consistent use of one hand rather than the other hand for a skilled task. Hand dominance is greatly influenced by genetics. A hand preference usually starts to develop between the ages of 2 to 4, however it is common at this stage for children to swap hands. But don't worry if your preschooler doesn't seem to care which hand she uses to hold her fork - some children remain ambidextrous (using both hands equally) until they're 5 or 6.
Any activities that encourages the different movements of each hand will encourage the development of hand dominance. Activities such as building with lego, tools such as hammering or using a screwdriver, colouring in, ball play, bowling, lacing and stickers in a sticker book make the child decide on which hand to use to do the activity and which hand assists and holds.
Notice, which hand initiates common activities such as brushing teeth, door opening and pointing to objects. Often children will start will start fine motor activities with their dominant hand and then switch to the non-dominant hand as the dominant hand fatigues. It is better to teach the child to rest his/her hand rather than switching.