Expressed breast milk
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5,5,5 rule applies (5 hours room temperature, 5 days in the fridge, 5 months frozen) but yes you can mix from different dates together. I wouldn't use from 13th if you will be mixing tomorrows milk, today would be the last day. X Link - https://www.weliahealth.org/2023/11/what-do-i-need-to-know-about-storing-breast-milk/#:~:text=The%20Centers%20for%20Disease%20Control,five%20months%20in%20the%20freezer.
Ok thank you both! XX
Yes they can be mixed 😊 also can see you're UK based - the NHS also state it can be in the fridge for up to 8 days so still usable! https://www.nhs.uk/start-for-life/baby/feeding-your-baby/breastfeeding/expressing-your-breast-milk/storing-breast-milk/
You can also freeze and defrost and mix different dates of milk - save you having to throw milk away because that breaks my heart
Yes, milk from different dates can be mixed together. However, milk should only be stored in the fridge for 4 days maximum, less if it is stored in the fridge door. I would recommend using the milk from the 13th for bath / cleaning baby instead ☺️