frozen milk bags unsealed

DanielleB27

So I froze milk back in September and just pulled it out of the freezer. I used the Medela bags, and I am pretty sure that I made sure they were sealed. When the bag unfroze, I could squeeze air out of it and the top seal wasn't sealed all the way! It has been sitting upright in my freezer, so nothing leaked out. My question is is the milk still good, or do I need to toss it? This is the second bag that has come out of the freezer like this. I'm not sure if I filled them too full, or didn't seal them all the way, or what happened. Any thoughts would be wonderful!