I will be going back to work, and have been pumping to build a freezer stash (I sometimes travel for work and want to be extra prepared, but will also be pumping at work). Currently, because of overactive let-down and over-supply, my baby is having issues with gas. I'm worried about feeding him frozen breastmilk if there could be a foremilk/hindmilk imbalance in the stored BM. Can anyone reassure me about this? Because of my oversupply issues, I tend to pump before putting him to the breast. I do breast compression/massage while pumping. I just don't want to be setting him up for more GI problems down the road.