I presume that you'll teach him to count his lefts at the same time that he's learning to walk. It'll be easier that way.
Honestly, though, my daughter (18) turned out to be an Equestrian and my son (16) plays baseball and lacrosse. You can never be sure where their interests will lead.
Have fun with him. Love him. Having children is one of the greatest (if not THE greatest) joy that I've had in life so far.
Congratulations!