I have be operating under the impression that the breastfed baby takes in
less BM from the breast than from a bottle because it takes a lot longer to
nurse than guzzle a bottle.  It takes approximately 20 minutes for the
stomach to signal the brain that it is full.  The typical bottle fed baby
will drink a bottle in under 10 minutes.  Even if given more than an
appropriate amount, this baby will cry for more -- We call it the
Thanksgiving Day Dinner.  Baby gorges himself because he thinks he is hungry
and its too late once the signal reaches the brain.  Baby's stomach is
stretched beyond belief and if baby has not thrown it up, he sleeps for hours
(right through those football games!)

Linda Barrett, IBCLC