You are definitely correct in your heating method! :-) never microwave breast milk changes the structure of it etc. Personally I think I wouldn't return to fridge but keep it up to maybe 3 hours if baby doesn't drink it then get rid of it.
I read that you can if it's the same day. But don't give her the same milk tomorrow. But most people say its best to throw it out due to bacteria
I put the bottle of milk in a cup of hot water to warm the milk
Did you heat it up? I was told you can't reuse breast milk or formula after its already heated.
Geez I can't remember hun :-( I want to say no but not sure. Ik it can sit out for 4-6 hrs at room temp and be refrigerated for I think up to 5 days? Im going to have to refresh on all this haha