I breastfed but wasn't able to pump, my daughter feed to often and I never had enough to then pump after, but I was always told by my docs that breast milk can be stored in the fridge for up to 5 days (at the back of the fridge, don't keep it in the door) and up to 6 months in the freezer. Always try and defrost breast milk by putting it into the fridge to defrost, not just leaving it on the side.