A big mistake!

Hi Ladies. Just venting. I left my 9 mo in the care of my mum and step-dad today for a work trip up north just for the day and said to them ive put water in all the bottles and left them on the bench next to a hand written note on her routine including times for bottles and how much formula etc. She heard me.

Coincidentally there was a out of date bottle of cows milk on the bench ready to get thrown out that had been sitting out overnight. My mother didn't listen and gave my baby the out of date cows milk thinking I'd made up a 2 litre bottle of formula. I mean wtf? We were due to be out until after bub had gone to bed tonight but luckily missed our flight this morning so returned home at lunch time. If we hadn't my mother would have fed our baby 3 more feeds of out of date cows milk. I'm furious. Disappointed. Horrified. Thankfully no vomiting or diarrhea YET and she seems ok but I have never ever ever felt more guilty leaving her without her parents. Add to that my mother wasn't persistent in getting her to sleep so by the time we were home bub had been up for 5 hours. Shes only 9 months the poor thing. She saw me come home. Reached up. Put her arms around me and just cried. I put her to sleep in 2 minutes flat where she slept for 2 hours. The doctor hotline says just keep an eye out for erratic behaviour and any vomiting etc so im hoping she will be fine. But I just can't come to terms with the lack of common sense....look.at this face. Even a swing can't make her feel better