The first thing you need to know is that you do NOT have to travel with a child to transport breastmilk with you while you fly! Formula, human milk, and juice are allowed in reasonable quantities in carry-on bags. You must remove these items from your carry-on bag to be screened separately from the rest of your belongings. Be proactive, flag your human milk for the TSA officer and take the bottle(s) or other containers out of the bag you have it stored in. Make sure to use a see-through container that makes it easier for the officer to see the content.