Here is a start. These are mostly abstracts, but I have full access to most journal articles via a university, so can add more detail on request (time permitting).
Most children with gender dysphoria will not remain gender dysphoric after puberty. Children with persistent GID are characterized by more extreme gender dysphoria in childhood than children with desisting gender dysphoria. With regard to sexual orientation, the most likely outcome of childhood GID is homosexuality or bisexuality.”
“…as the World Professional Association for Transgender Health notes in their latest Standards of Care, gender dysphoria in childhood does not inevitably continue into adulthood, and only 6 to 23 percent of boys and 12 to 27 percent of girls treated in gender clinics showed persistence of their gender dysphoria into adulthood.”
“Multiple longitudinal studies provide evidence that gender-atypical behavior in childhood often leads to a homosexual orientation in adulthood, but only in 2.5% to 20% of cases to a persistent gender identity disorder (3, 6, 22). Even among children who manifest a major degree of discomfort with their own sex, including an aversion to their own genitalia (GID in the strict sense), only a minority go on to an irreversible development of transsexualism.”
“At follow-up, 3 participants (12%) were judged to have GID or gender dysphoria. Regarding sexual orientation, 8 participants (32%) were classified as bisexual/homosexual in fantasy, and 6 (24%) were classified as bisexual/homosexual in behavior. The remaining participants were classified as either heterosexual or asexual…
It is conceivable that the childhood criteria for GID may “scoop in” girls who are at relatively low risk for adolescent/adult gender dysphoria that revolves so much around somatic indicators.“
“In a study of pre-pubertal male and female children with gender dysphoria followed-up approximately 10 years later, only 27 percent of children with gender dysphoria remained gender dysphoric at follow-up . Of those individuals who no longer expressed gender dysphoria at follow-up, a significant portion (all female and half the male participants) expressed a non-heterosexual sexual orientation . Thus, gender concerns in neurotypical children prior to puberty may represent a developmental process related to both gender and sexuality for many individuals. ”