Its my first time attempting combo feeding with breast milk and formula. I want to do 80% breast milk and 20% formula for her feed.
If I pump my breast milk now, can I add it straight to the baby dr browns bottle and mix in ready to drink formula? If I do this now, do I have to get her to drink it straight away?
Or, Can I put it in the fridge for later use? If yes, how long do I have to use it?
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As far as I know you should mix milks together only at the same temperature

Can I ask why you want to do this?
When I was combo feeding before my supply fully kicked in I was told to feed breast milk and then if still hungry top up with formula.
Combo normally means both but in separate feeds rather than mixed together.
I would refrigerate the breast milk then add in the ready to drink formula (refrigerated) when you want to feed it to her. The ready to drink stuff needs to be consumed within 24 hours once open. Breast milk lasts days in the fridge so I wouldn’t mix it until using.