Even-Handedness
To be fair, I used to think people were born either "right-handed" or "left-handed." It was something that other people talked about so I presumed they knew better. Well, they didn't. My experiences as a parent has confirmed my suspicion that "handedness" is purely a learned habit.
I noticed that by habitually carrying my daughter in my right arm, I mostly freed up her right hand as her left was around my shoulder. When she pointed or reached out it was with her free arm. And when I handed her things, or teaching her to color with crayons I favored the hand she did. I was inadvertently reinforcing one-handedness. Now make it a point now to put objects in her left hand so she can develop her skills as evenly as possible and it seems to be working.