Re-refrigerating breast milk

What’s everyone’s opinion on re-refrigerating breast milk? This morning my husband was trying to feed our son but he just wasn’t interested in the bottle so I took him to feed him instead. (My husband feeds him one bottle every morning to get my son used to a bottle and someone else feeding him before I go back to work) the bottle went back in the fridge but should I just toss that bottle instead? I can’t get a clear answer from any sites about putting a bottle back in the fridge.