storage question??

[amber469]

I have a quick question. My baby is 3 months old and I rarely pump and use a bottle, but have on occasion. My parents are babysitting this weekend, so I wanted to have a bottle of breastmilk on hand for them to use. I had pumped 2 ounces and put it in the fridge. 48 hours later I pumped 4 more ounces into that same  bottle and stuck it in the freezer. Later I read not to add after 24 hours to already expressed milk. Does anyone know why this would pose a problem??? Don't want to waste what I worked so hard to get, but don't want to make my baby sick either.

[gdiamante]

Had you cooled the milk from the second pumping? It's OK to combine two pumpings but all the milk must be cooled to the same temp.