Milk expression

[Annacip]

in 1 given day during different feeds can I give my 2 month old expressed milk from different days? Also if she feeds for 10 min do I just express for 10 min to match her feeding amounts ? I just expressed for 10 min and only 2oz came out was shocked that that’s all she ate?!

No it doesn't match. The amount you express is usually much less than the baby would take as they're much more efficient at getting their milk than pumping. I could barely express anything despite having a very good supply.

Re different breast milk, that's fine.
The main rules are, once you've expressed, it lasts for 6 hours at room temperature, 6 days in the fridge and 6 months in the freezer. It's ok to mix and match from one feed to the next, but don't mix freshly expressed warm milk in with cold previously expressed milk. So once it's cold, leave it that way until you want to "serve" it.

Also, breast milk is a great medicine so even if you can no longer feed baby with it, if you have spare, freeze it and it's great for things like sore skin, eye infections etc. It's amazing magical stuff!

Great thank you so much both!!

Your baby is much more efficient than the pump. You should pump roughly at the same time that a bottle is given to baby in order to keep your supply up, assuming you're exclusively breastfeeding?

Also, are your shields/flanges fitted properly? All the standard ones are too big for my nipples so I had to buy the smaller ones for my pumps. That will affect quantity of milk but also comfort.