It absolutely is not. Children cannot consent to sterilizing medical procedures. Doctors are prohibited by law from performing tubal ligations on women under 18, and most won’t do it on women under 30.

The science on trans youth is evolving rapidly; the UK, Sweden, and Finland just severely curtailed use of blockers and hormones on minors due to the clear risks of harm and unclear risks of benefit. I expect the US to follow suit in a few years, once our current political fever breaks and the medical evidence remains. The Society for Evidence-Based Gender Medicine is a good place to review the science and track new developments:

https://segm.org/