OP, I'm an MB. I had twins and getting them on a schedule was critical to us - so I support a mother who wants a schedule. But it can also catch us by surprise when a baby takes a leap to a new level in terms of appetite, sleep patterns, etc...
Have you talked to the MB?
Maybe you could just sit down with her and say that it seems like the baby is really ready for more, and inyour experience you've seen babies taking as much as 6 oz every 3 hours at this point. Ask her if it would be ok if you offered more? Don't necessarily try to alter the schedule at the same time - start with upping the amount. (Or ask to change the frequency - just don't push on both fronts simultaneously.)
My hunch is that with 6 ounces the baby might be fine every 4 hours - but that can vary from one kid to another. So just try talking to her. Don't come at it from the mindset that she's abusing or neglecting her child, just say that you think he's still hungry - could you offer him a little more.
If she's rational she'll probably be fine with that. If she really resists then you have a larger problem on your hands!
