Formula bottles

Vi

Hey guys, Im a FTM and this is my first week 🤗

Overwhelmed , excited and overthinking everything.

If I have a bottle of formula , I made a large bottle for the first time and it’s about 5oz , my LO only ate 2 oz and I have the 3oz remaining.

Can I keep the rest refrigerated and use a different nipple for next feeding ?

OR

since he drank out of the bottle already, I need to discard the rest?

Thank you for the help.

Xo