Quoting kyannasaurus:" My baby is almost 6 months and she's breastfed. I love it and I'm really proud of us. I'm on parental ... [snip!] ... anytime soon but it would be nice to get a sitter for a few hours here or there and know she's happy and fed. Thanks ladies "
Ya, I don't know what formula vs. breastmilk has to do with the problem.
Also, it won't kill your 6 mo old to hold out five hours on only a few oz while she is babysat. I bet if you stayed away longer she would end up eating more from the bottle, but it didn't come to that.