Christy Olezeski, director and co-founder of the Yale Pediatric Gender Program, declared that her team offers advice on if and when youngsters should seek "medical intervention."
She later bragged in the clip posted on Yale Medicine's YouTube page that she "loves" what she does.
The video ignited outrage online as she was cautioned to leave the children alone, and others even argued it was child abuse.
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In the footage, Olezeski explained how her mission was to "provide comprehensive family-centered care for children, adolescents and young adults questioning their assigned gender and/or seeking gender-affirming consultation."
She states: "I am the director of the Yale gender program, which is an interdisciplinary program working with gender-expansive individuals [ages] 3 to 25 and their families."
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"We help individuals who question their gender identity or identify as transgender or non-binary, and we help them with their gender journey."
The program website explains how transgender surgeries are just available to those aged 18 and older.
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There is no information about how young hormones and puberty blockers may be presented.
She further declares how the program she heads provides guidance on "medical intervention" and when such a process should begin.
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"I love what I do so it's wonderful to be working in this field and to be working with individuals who are gender diverse and gaining their support and helping them on their gender journeys."
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The idea of children barely out of wearing diapers choosing to change genders was met with outrage on social media.
"3-YEAR-OLDS should not be led to change genders! Leave them alone," director and producer Robby Starbuck tweeted.
"Society has lost its marbles," tweeted Arizona Republican Party Chair Dr. Kelli Ward.
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"Kid's memories are just starting to work at 3. Kids think they're dinosaurs or a dog. There is no 'gender journey' at 3; this is child abuse," proposed the Hodge Twins comedy duo on Twitter.
"I want Christy Olezeski to tell me how a 3-year-old can have a gender identity crisis. Kids that young have no clue or even think about that when the last time you heard a 3-year-old say I'm a girl but feel like a boy or whatever," wrote Pat Cordia.
"Does this Yale Gender Programme Clinical Psychologist's starry-eyed happiness about working with 3year olds worry others as much as it worries me? What does actual Psychology have to say about this?" continued another Twitter user.