The story of the child who started the transgender bathroom debate is being released as a Netflix documentary in the New Year.

As a four year old, Coy Mathis liked dolls, pink and princesses. She knew for certain that she wasn't a boy, even though she had been born into a male body.

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When she started school, Coy was initially forced into a boy's uniform, but after great upset her parents and the school allowed her to continue her education as a girl.

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One day, the school said Coy would no longer be allowed to use the girls' bathroom after complaints from some parents. When Coy's mum fought back, arguing that this breached Colorado's anti-discrimination laws, a legal battle ensued that would become totemic for the transgender movement.

Coy's story has been documented in a film titled Growing Up Coy, which will be released to 190 countries on 6 January via Netflix.

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The news comes as the NSPCC reported that it takes an average of eight calls per day from children who feel they have been born in the wrong gendered bodies.

And, earlier today, National Geographic made history by featuring a transgender person – 9-year-old Avery Jackson – on the cover of its January subscriber's edition.

Finally, society is starting to recognise the need to celebrate the plethora of gender identities and educate others on the importance of acceptance.