I always have one that produces more at a given time than the other, they like to take turns too. LOL. The worst was with my bio's... I would get HUGE and I made enough milk for a dozen babies it seemed, and the one who decided to make more would be bigger for a day or two until they evened out...

That is awkward!! LOL I notice a difference in my production with induced lactation between the two sides, but not where you can see it through my shirt, lol.