Did I store my milk wrong?

I pumped and bagged and put my milk in a chest freezer. It's been about 3 months (baby almost 6) so I'm starting to make baby food to prepare. I'm adding breast milk to purees to make them thinner, and my bagged milk smells repulsive! Not exactly that sour milk smell, but just horrible. What did I do wrong? or is this normal??

Can I still use it? Do I have to throw it all out?

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