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There isn't an exact answer to this question because most doctors and researchers don't know.
However, I came across an interesting theory on a "Miracle of Life" documentary on the Discovery channel.
Basically, it explored the idea that people who are left handed actually started out their gestational life (in the womb) as a twin. When the egg divided, one embryo got the left handed gene while the other got the right handed. If you were not born with a twin, then your twin was reabsorbed into the womb and wouldn't have shown up in any ultrasounds.
This should not suggest that every left handed person started out as a twin, but there has been some research done on this theory.
What else can I help you with?
Was Winston Churchill left handed?
churchill was righthanded
Is Cara Gosselin righthanded or lefthanded?
I think she is left handed.
Sarah Palin righthanded?
Yes, she is righthanded.
Is Amy the hedgehog righthanded?
Yes, she is righthanded.
Is travis barker left handed?
yes, but he play drums like a righthanded, like me.
What hand does Sabrina carpenter write with?
Jennette is righthanded
Which hand did Willie Mays play with?
He threw righthanded and batted righthanded.
Is Taylor Swift lefthanded or righthanded?
Taylor Swift is right-handed.
Is tom kaulitz right hand or left hand?
By the way he plays guitar, he is right handed.
Is oli murs lefthanded?
righthanded
Was Joe DiMaggio a switch hitter?
No, he was a righthanded batter.
Why are bowling shoes righthanded and lefthanded?
Because for example right handers slide with their left foot up to the foul line. So this shoe is made to slide and the other is made to grip
