I have a 3 month old and have been back to work for a few weeks now. I have about 50 frozen bottles of breastmilk. Each week, I give the babysitter enough frozen bottles to use for the week, and as I pump bottles at work, I add them to the freezer. So, I have been able to keep the number of bottles that are frozen at around 50. Is this the best way to use them though? I thought it was, because I am using the oldest ones first and this way none of them should go bad. However, I know it is better to give the baby freshly expressed milk. I could use what I have pumped the day before, but then wouldn't the frozen bottles potentially get wasted? I am hoping to keep nursing/pumping for a year and even if I use some of the frozen stash from time to time, it seems like I probably wouldn't use all of it during that time if my pumping remains as it is. Appreciate any thoughts - thanks!!