I know you can't refreeze breastmilk once it's been thawed, but what do you do when you have milk in the regular part of the refrigerator that you've warmed up to feed your child and she only takes a sip and falls asleep? Can you put it back in the frig and warm it up again later, or leave it out and warm it up again later, or just throw it away, which hurts to do? I can't seem to find this answer in my Womanly Art of Breastfeeding, or What to Expect The First Year. Help!!!