New mother Juliet Thomson claims that she was traveling on a United Airlines flight when a flight attendant told her to cover up while breastfeeding her 4-month-old baby after another passenger complained. She described feeling humiliated — and now, she will "absolutely [be] taking legal action," she said in an interview with YouTube celebrity Joey Salads.

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Thomson said she believed it's against United's policy to ask a breastfeeding mother to cover up unless the activity is causing real harm to a child or another passenger. "In this case, it was clearly not causing harm to anyone," she said.

For its part, the airline told The Huffington Post it is looking into the incident:

“Both United Airlines and Skywest Airlines, which operated the United Express flight, welcome moms nursing onboard our aircraft and instruct employees to do their best to see to those moms’ comfort. Skywest is researching the circumstances of that flight whether the flight attendants efforts may have simply been to try to calm a difficult situation for Ms. Thomson.”

Thomson told Joey Salads, whose channel focuses on breastfeeding activism, that a woman sitting a row ahead of her became bothered when she started feeding her child on the flight.

The complaining passenger reportedly made a scene in front of flight attendants, one of whom eventually said to Thomson, “Listen I know it’s natural, but it’s offending this woman. So if you don’t mind covering up, it seems your baby is asleep now,” according to Thomson.

Thomson said she was embarrassed and “felt ganged up on.”

One of the best ways to keep children calm and keep their ears from hurting when traveling is to breastfeed, Thomson argued. "It's the most normal and healthy thing. But then when stuff like this happens, we're afraid to do it again because of the fear of being shamed again, [or] being embarrassed in front of an entire crowd of people that you don't know," Thomson said.

The incident inspired Thomson to start the hashtag #MomsDontFlyUnited.

Your move, Airlines: support mothers doing something hard, necessary, & important or make their critics more comfortable. #momsdontflyunited

— Alexis Lindquist (@AlexisLindquist) February 8, 2016

Thomson also posted an Instagram picture of her breastfeeding her baby girl as a public letter “to the lady sitting in row 19a.”

Such instances of breastfeeding shaming are not uncommon, but are being more widely discussed as women stand up for their right to naturally feed their babies in public.

For more on the fight to normalize breastfeeding, check out this video from ATTN:.