Hi all-- I've seen the kellymom.com milk calculator for expressed bm when bottle feeding, but then I've seen other websites that suggest feeding a LOT more bm according to weight. I'm confused! My son is about 15.5 lbs, 4.5 months old, and he's fed 6-7 times/day. We've been feeding him 4 oz expressed bottles while I'm at work ... and for the past few days he's been VERY fussy, and we can't figure out why... but suspect he may need more milk. Any suggestions? Could it be when he's at the breast he gets more milk, and the bottles aren't full enough? Thanks!