In the April 2011 issue of Parents magazine, Cristina Rouvalis wrote an interesting article about a child's handedness. This is one of the many things that I love watching develop with identical twins; just how similar are they. Are things such as their handedness determined by genes or habits formed throughout their early years.
The article states that kids typically don't show a preference for one had over the other until age 3 or 4.
A University of Toledo psychology professor also provided these interest facts.
"Almost 90 percent of kids are right-handed, meaning the brain's left hemisphere controls their writing and other fine-motor skills. Righties are often better at multi-tasking: it's easier for them to use both sides of the brain at once.
If your child writes with his left hand but uses his right for other activities, it doesn't mean he's truly ambidextrous. That's a rarity occurring in less than 1 percent of people. Lefties might be more creative; they tend to have a larger corpus callosum, a brain structure that controls out-of-the0box thinking."
While that doesn't answer all my questions, it does point out a few interesting facts. I may have to do a little more research into this one myself!