Governor Mike DeWine vetoed a bill to ban medical treatment for transgender minors, an unusual move for a Republican governor. The legislature has the power to override his veto. The governor said that the decision about such care should be made by the people who love the child most: parents.

In addition to banning transition care for minors, the bill says medical professionals who provide the care could lose their licenses and be sued. It also prohibits transgender girls and women from playing on high school and college sports teams that correspond with their gender identity.

On Friday, Mr. DeWine said that if the bill were to become law, “Ohio would be saying that the state, that the government, knows better what is medically best for a child than the two people who love that child the most, the parents.”

The governor reached his decision after visiting hospitals and meeting with families “both positively and negatively affected” by gender-affirming care last week, a spokesperson said…

In addition to banning transition care for minors, the bill says medical professionals who provide the care could lose their licenses and be sued. It also prohibits transgender girls and women from playing on high school and college sports teams that correspond with their gender identity…

This summer, the American Academy of Pediatrics commissioned a systematic review of medical research on the treatments, while still taking the position that they can be essential. Transgender adolescents have high rates of depression, suicidal thoughts and self-harm, and some evidence suggests that puberty blockers and hormones, in the short-term, could improve their mental health.

“The most harrowing part of my job is informing parents that their child died, especially when their death was from a preventable suicide,’’ Dr. Steve Davis, chief executive of Cincinnati Children’s Hospital, told Ohio senators at a hearing on the bill. “You trust us on every other condition. Please, trust us on this one.’’