oh.. in this case, you can try to do this (as suggested by my Dr).
Half the meal and feed more frequent. Don't feed baby full. For example, if you now give 6oz to baby every 4 hrs, you can try to feed baby with 3oz milk every 2hrs.
Baby needs to have "trainning" again on poo poo timing via this method. And I found it worked for my baby.
Or you may need to think of changing to other brand of milk. I changed to another brand from O-Lac for my baby.