A couple of things that might be worth noting. My own peer-reviewed research;
transkids.synthasite.com/resources/NatachaKennedy%20%282010%29%20-%20updated%20version.pdf
...clearly demonstrates that the age at which trans people become aware that they are trans is very young; mean average is 8, modal average is 5. So a child coming out as trans in year 4 is not unusual in the sense that she is discovering that she is trans, but unusual that she has the strength of character not to succumb to the cultural and social pressure to conceal or suppress her real gender.
Also, the figures about so-called "desisters"; children who are trans when young but do not grow up trans, is seriously contested. The explanations for this apparent change of heart ignore the social pressures on these children to conceal and suppress, especially when they are treated by parents, teachers, other children's parents and psychologists, as problematic. So far the organisation for parents of trans children, Mermaids, has not been able to find any instances of any trans child changing their mind, when they have been properly supported by their parents, schools and others around them.
The majority of studies which suggest that most trans children do not become trans adults are also carried out by people who have an interest in the outcome; often psychs whose careers depend on selling to parents the idea that they can 'cure' trans children. They are also carried out by psychologists, not sociologists and as such fail to account properly for social and cultural pressures on tarns children to conform to stereotypical gendered behaviour.
My research also highlighted the depressing statistic that the second largest source of bullying that trans children received from adults was from parents of other children (the first was from school staff). This is supported by anecdotal evidence from people like Livvy James, the young trans girl in Worcester, who was quite literally abused by other kids parents in school and in the street.
Why does this happen? Well this blog;
image-not-available.blogspot.co.uk/2013/01/its-not-about-burchill.html?m=1
by a trans woman explains it very well; we live in a world which is media saturated, and that media is saturated by ubiquitous negative images of trans people. These portrayals of trans people have an effect in that they make the majority of people believe that we are evil, fetishists, wiredos, freaks who eat children, bite the heads off whippets...
Actually trans people are just like everyone else; only trans. And trans children just want to do whatever other children do; as this wonderful, moving and inspitrational trans child campaigning for her own human rights in the US shows in her own words;
Trans children need only acceptance in their real gender identities. There have been trans people in every civilisation that has ever existed in all of human history according to painstaking research by cultural historian Marjorie Garber; in native American societies trans women were teachers and foster parents, looking after older children of mums who had too many babies and toddlers to contend with. The problem is not trans people or trans children, but the way society and a culture dominated by a sensationalist and divisive media demonises trans people.
I would ask that you have a look at the words of an 11-year-old trans girl, who has been kept out of school in America foe many years because of negative attitudes by other children's parents.
www.huffingtonpost.com/2013/01/23/transgender-girl-obama-speech_n_2533298.html