The Biden administration recently sued Alabama at the Supreme Court to try to strike down Alabama's ban on forms of gender-affirming care for minors.
The court documents are a very illuminating source on this topic.
From the Alabama brief:
"A 2017 survey found that a majority of WPATH-affiliated plastic surgeons in the US had performed transitioning "vaginoplasties" on on minors, "thereby contravening" the WPATH standards at the time [...]. In this context, "vaginoplasty" refers to [...] the attempted creation of a faux-vagina in a teenaged boy that begins by "removing the penis, testicles and scrotum.""
This suggests that it's happening and it's not rare. There is plenty more about top-surgeries on children as young as 13, but I'm restricting this to vaginoplasty.
It is also a fair depiction that 'Democrats' are doing this. The Biden administration case was joined in support by 22 Democratic Attorneys-General, and joined in opposition by 19 Republican and 2 Democratic Attorneys-General.
And the court documents also revealed pressure put on W-PATH by the administration (Admiral Levine) to remove proposed age limits from draft W-PATH guidance because of political concerns. That's in the court papers, and was also reported on by the NYT.
"Levine's office contacted WPATH [...] with a political concern: that the list of "specific minimum ages for treatment," "under 18 years, will result in devastating legislation for trans care". Following this, W-PATH agreed to remove ages from SOC-8.
https://www.alabamaag.gov/wp-content/uploads/2024/02/2024.02.01-Ala.-Amicus-Br.-iso-TN-KY-BIO-FINAL.pdf
https://www.supremecourt.gov/DocketPDF/23/23-477/328275/20241015131826340_2024.10.15%20-%20Ala.%20Amicus%20Br.%20iso%20TN%20FINAL.pdf