my nanny told me my daughter use left-hand when she was half year old, as she experienced and i also saw my daughter used left hand most, even you pass thing to her right hand, she then pass to her left hand. now she will use both hands, i will let it be normal, heard my friend his mum forced him changed when he was little, he think he's not as smart as he was = )
left-hand user is smarter is true, as right brain control left hand, left brain control right hand and right/left brain response to different tasks ...... most people use left brain more, if your b use both, it's the best to train both right/left brain la !