Azeen Ghorayshi

The state’s medical board, whose members are appointed by the governor, has barred doctors from prescribing gender care to new adolescent patients.

Small studies suggest that breast removal surgery improves transgender teenagers’ well-being, but data is sparse. Some state leaders oppose such procedures for minors.

The National Health Service is closing England’s sole youth gender clinic, which had been criticized for long wait times and inadequate services.

New estimates based on C.D.C. health surveys point to a stark generational shift in the growth of the transgender population of the United States.

Some girls are starting to develop breasts as early as age 6 or 7. Researchers are studying the role of obesity, chemicals and stress.

But the study, which began in 2013, may not fully reflect what’s happening today, when many more children are identifying as trans.

The test leads people undergoing in vitro fertilization to discard thousands of embryos each year. The new research found implanting some “abnormal” embryos resulted in...