Hi Denise, Probably this is the obvious that you've already considered, but is the baby regurging the next feeding after the bottle of formula? If so, did the mom pump somewhere around the time she fed the formula? If not, I'd guess that the baby is just overflowing from getting an extra-big feeding. Becky Krumwiede, RN, IBCLC [log in to unmask] [log in to unmask]