I had a few bottles of milk in the fridge for four days. All were from the same day, just different pump sessions. When I took them out in the morning and gave them all a sniff (like I normally do before sending them with my DD to the sitter), I noticed one of the bottles smelled a little sour (reminded me of the smell of her spit-up). No chunks, just stinky. I dumped it.
It was within the range that is acceptable for refridgerator storage and hadn't been left out or reheated or anything like that. This is the first time this has happened to me and it's bugging me.
Any thoughts? Thank you!