Little Vivian Hagmaier of Pennsylvania wept in disappointment after learning that her unborn sibling was a boy.
Someone captured the four-year-old girl's reaction in a video, which was posted on Facebook seven months ago.
Her parents told Vivian that she would get a pink bow in her hair if her mother was pregnant with a girl and a blue bow if she was expecting a boy.
Vivian had been looking forward to a baby sister.
When she was asked how she would react if her unborn sibling would be a boy, she said: "I'd cry forever."
When she opened her eyes in front of a mirror and saw a blue bow in her hair, she dropped to the floor and cried.
"I have a baby brother and I like him," Teresa, Vivian's mother, said, in a bid to appease her seemingly devastated daughter.
"No!" Vivian, who was in her pajamas, said as she yanked the blue bow off her hair and wept hard. Disappointed was all over her face.
"It's okay, it's okay," Teresa can be heard saying.
Interviewed by ABC News, Vivian's mother Teresa said of her daughter: "She kept telling us, 'If I have a brother I'll cry forever.' We wanted to record it to see if she would. I was surprised at the extent to which she followed through."
Teresa said that it took 30 minutes before Vivian recovered. She showed a photo of her daughter smiling while pointing out the blue bow in her hair.
She said that Vivian has already accepted that she would have a baby brother and not a baby sister. In fact, she asked Santa Claus for a boy doll for Christmas, Teresa said. "He will be accepted I think," she said of her second child, who was to be born in April 2018.
Read more on our Twitter account @amomama_usa.