Has anyone had issues with certain fruits or vegetables that go sour after a day or two when mixed with breast milk? I prefer to make my LO's foods with breast milk as oppose to water. I don't know why, but I made sweet potato stored it and by second day tasted sour. Just didn't taste right . I wasn't gonna feed my baby girl THAT. However; i did notice that if I make it and serve it to her right away it's fine. Soo weird. Guess sweet potato and breast milk in the refrigerator don't mix. Lol... I made her avocados bananas and it works fine. Has anyone had same problem? If yes, with what fruits or vegetables? Any advice.