Quoting Jen in Georgia:" I am having to use formula. I still nurse at night and pump while working but she is eating more than ... [snip!] ... but she is eating more than i pump. she runs out of breastmilk at babysitters and give her formula but cries and dont want it"
switching back and forth between breastmilk and formula may be messing w/her digestive system (since breast milk is esier to digest) Try having the sitter mix the breastmilk & formula 50/50.....2oz of breastmilk w/2oz of prepared formula. That way baby isnt getting straight formula (which can cause a breastfed baby tummy and bowel issues)