https://tspace.library.utoronto.ca/bitstream/1807/34926/1/Singh_Devita_201211_PhD_Thesis.pdf
Most boys with gender dysphoria are able to heal.
Of 88 boys who met the complete diagnostic criteria of Gender Identity Disorder (GID), which includes strong cross-sex identification (i.e. insistence that one is, or a wish to be, the other sex), only 12 still had GID after several years. That means 86.4% of them just stopped being dysphoric.
Of 51 further boys who met some of the diagnostic criteria of GID, 5 still had GID after several years. That means 90.2% of them stopped being dysphoric.
http://www.sexologytoday.org/2016/01/do-trans-kids-stay-trans-when-they-grow_99.html
(Includes studies in this page.)
Most children who are gender nonconforming and/or are diagnosed with gender identity disorder do not end up identifying as transgender.