My only question is why “trans kid.” Trans kids were simply not a thing in the early 2000s.
I'm a bit late with this but figured it would be good to lay out a timeline, especially as this thread is mostly the Sander show. Number one rule to remember: Jeanette lies.
1986: Triptorelin is first licensed as a medicine for treating prostate cancer.
1987: Utrecht paediatric gender identity clinic is set up by Peggy Cohen-Kettenis
1989: GIDS at the Tavistock opens. Louis Gooren is appointed the world's first professor of transsexuality at Vrije Universiteit Amsterdam and works closely with Cohen-Kettenis.
1990: The initial findings of a trial for treating central precocious puberty with Triptorelin is published. Peggy Cohen-Kettenis and paediatric endocrinologist Henriette Delemarre-van de Waal decide to experiment with prescribing a gender non-conforming 13 year old girl triptorelin.
1995: Valentijn de Hingh is referred to the Dutch clinic age 5 for playing with dolls, and is diagnosed with gender identity disorder. A documentary crew would later start filming bits of Valentijn's life. Cohen-Kettenis is elected to the board of directors of WPATH (then the Harry Benjamin Association).
1996: Gooren and Delemarre-van de Waal publish their first article on the "Dutch Protocol" of puberty blockers for gender identity disorder based on their first case.
1997: David Reimer comes forward about his experiences, blowing open the field of sexology by discrediting John Money's previously widely accepted theories.
1998: Cohen-Kettenis publishes further findings on the 13 year old, who is now 18 and has had SRS.
1999: Gooren is elected to the board of directors of WPATH.
2000: Jazz is born in October. Dr. Norman Spack travels to the Netherlands and learns about "the Dutch protocol", although at this point it had only ever been administered to seven children under the age of 16.
2001: WPATH SOC v6 is published, explicitly identifying the need for treatment pathways for children and adolescents. Jeanette notices Jazz is drawn to dolls even when he's still teething.
2002: Sunshine Social Services, Inc. (trading as SunServe) is established, touting itself as "the first Gay and Lesbian Faith Based Social Service Agency in the United States". Deborah Eve Babyatsky-Grayson (Cousin Debbie)
joins their counselor collective as someone with a strong background in serving the needs of GLBT clients. Peggy Cohen-Kettenis is appointed Professor of Medical Psychology Vrije Universiteit Amsterdam Medical Centre. Valentijn de Hingh begins puberty blockers at age 12.
2003: According to Jeanette, Jazz begins displaying even stronger gender non-conforming behaviour, insisting he is a girl and his name is "Sparkles".
2004: Jazz begins throwing tantrums about not being allowed to wear girl clothes. Jeanette - who claims to have a master's in Clinical Counseling - apparently started flipping through a copy of the DSM IV she happened to have one day, and discovered "gender identity disorder" and based on the criteria diagnoses Jazz with gender dysphoria. She takes Jazz to a paediatrician, who refers Jazz to Dr. Marilyn Volker at Children's Hospital Los Angeles. Dr Volker confirms the diagnosis.
2005: SunServe begins offering
family and youth services. Jazz "comes out" at his fifth birthday party, selecting the name Jazz (inspired by Ari having dressed up as Jasmine once). The family start using she/her pronouns and letting Jazz wear girl clothes outside, although the pre-school is not supportive. Jeanette starts looking for parents of trans kids on the internet, and makes contact with Trans Families of Cleveland - who are all astouned at how young Jazz was transitioning, and praise Jeanette - as well as attending the annual Philadelphia Trans Health Conference for the first time, which she would go on to attend annually.
2006: From early 2006 Jeanette begins speaking at panels for parents of transgender children that she found on the internet, and is featured in an article in The Reporter
Some people say to me, “How can you let him walk around looking like that?” And I say, “Because that's what she picked out to wear today.” We are doing something right because Jazz,rather than focusing on gender issues, lives a happy and well adjusted life. [...] How young is too young? I don't think it's ever too young to be who you are. At this point, what's the worst that could happen? If she changes her mind, we'll transition back. I'm trying to leave the door open, and I'm checking in with her feelings. I worry about today, and tomorrow I'll worry about tomorrow.
Peggy Cohen-Kettenis and Henriette Delemarre-van de Waal publish their seminal paper on the Dutch Protocol, funded by Ferring Pharmaceuticals (the manufacturer of Triptorelin). SunServe begins operating "SunCentral", an LGBTQ teen drop in centre. Dr. Spack meets with Susie Green from Mermaids, and agrees to prescribe 12 year old Jackie with puberty blockers. Jazz begins kindergarten. Jeanette and Greg engage the services of an attorney to ensure that Jazz is entitled to attend in girls clothes and be addressed as a girl, although is still required to not use the girls' toilets.
2007: Boston Children's Hospital opens the first paediatric gender identity clinic in the USA, co-founded by Dr. Spack, and begins rolling out puberty blockers as standard. Valentijn de Hingh's documentary is broadcast on Dutch television. Jeanette establishes the TransKids Purple Rainbow Foundation with Cousin Debbie. Jazz appears on Barbara Walters. Dr Spack joins Cohen-Kettenis, Gooren, and Delemarre-van der Waal on the Endocrine Society’s committee tasked with writing their first clinical guidelines for ‘transsexual persons'.
2008: Jeanette posts a video of Jazz talking about being trans on her YouTube channel, GnetLuvsGreg. Jeanette separately claims to have chatted to Jazz about the side effects of medical transition and how it would mean Jazz could never make a baby, which makes Jazz sad. Terry Reed, co-founder of GIRES, asserts in an interview that not giving children puberty blockers will make them suicidal.
2009: The Endocrine Society publishes new guidelines recommending puberty blockers for children with gender dysphoria. Jazz appears on an Australian news show. Jazz is banned by the Youth Soccer Association from participating in girl’s travel soccer games (although Jazz can still practice with the girls). Jazz attends Camp Aranu'tiq, the first ever trans kids camp.
2010: Cousin Debbie begins her PhD in Clinical Sexology at The American Academy of Clinical Sexology.
2011: SunServe specifically begins offering "all the documentation your medical provider will need for you to begin transitioning" in line with latest WPATH guidelines. It also splits the transgender youth group off from the main LGB group.

WPATH releases SOC v7 that specifically identifies treatment with puberty blockers as the appropriate intervention for children with gender dysphoria. Jazz and family are filmed for a one hour special called "I Am Jazz: A Family In Transition", is interviewed by Rosie O'Donell and Chaz Bono and appears on the Dr. Drew Show. During the documentary Jazz also participates in a panel discussion with transgender adults mediated by therapist Dr Volker, appears distressed by their descriptions of puberty, and enthusiastically states "I want boobs", Greg uses his skills as an attorney to make the US Soccer Federation allow Jazz to play in girl’s-league travel games.
2012: In June, Jazz is implanted with Supprelin (a slow release puberty blocker). Jeanette films Jazz for a YouTube video called "Message to Obama". Jazz starts middle school. Valentijn de Hingh gives a TedX Talk about youth transition.
2013: Jazz begins estrogen treatment.
2014: In January, Cousin Debbie publishes her dissertation on treating trans kids with art therapy. Jazz's implant wears off and another one is implanted.
2015: I Am Jazz premiers.