I know so many people IRL who either breastfeed or have breastfed, but they say they had to supplement. I was bullied into supplementing a bottle of formula a day until DD was about 2 months - then I decided that a bottle was going to lead to 2 or 3 and so on. So I cut out the supplementation. DD's weight gain isn't fabulous, but it's adequate and she has hit all the milestones with a big smile on her face. So why do so many people supplement and how do they know how much to supplement? I don't ask in a snarky, holier-than-thou type of way... just out of curiosity. Hope I don't sound too silly.