okay only 2 people, I'm entering it into random.org, with Chelle as #1 and Rachel as #2.
And it's #2, Rachel!

Let me know your address Rachel and I will send it right off.
Incidentally, Rachel also gave the correct answer, it is my trusty RIGHT boob that produces more milk. Though Chelle, your answer was so close.
Oh and Angela I am right handed so your theory didn't work on me.