Anyone who has flown post-9/11 knows how tough airport security can be. Take off your shoes, remove your laptop, get rid of your jacket, and put your liquids in a clear zip-lock bag. One mother is upset over the rules, however, since she was forced to dump nearly four gallons of breast milk, including some that was frozen, according to The Washington Post.

Jessica Coakley Martinez, the mother of an 8-month-old son, was attempting to depart from London’s Heathrow Airport when aviation officials told her she couldn’t bring 14.8 liters of breast milk onto the plane.

“You made me dump out nearly two weeks’ worth of food for my son,” she wrote in an open letter to the airport on Facebook. “This wasn’t some rare bottle of wine or a luxury perfume I was trying to negotiate as a carry-on. This was deeply personal. This was my son’s health and nourishment.”

Heathrow said that the United Kingdom’s rules for liquid carry-ons are listed for passengers on its website. Set by the Department for Transport, they state that liquids may only be carried in containers holding 100 milliliters (3.4 ounces) or less in a transparent, re-sealable bag. Exceptions can be made for baby food or breast milk, but only if the passenger is traveling with the baby.

Martinez acknowledged that she should have looked up the rules in advance, but called the stipulation about traveling with an infant “unfair and exclusionary in consideration of all of the other working mothers like me, who are required at certain times to spend time away from their baby, but intend to continue to breastfeed them.”

Martinez wrote that she became tearful and irate because it was the only appropriate reaction to the situation.

“Beyond literally taking food from my child’s mouth,” she told the airport, “you humiliated me and made me feel completely defeated as a professional and a mother.”