SEATTLE — Meghan Trainer’s second child was born a boy, but at age 4 1/2 , Brody became Brie and now lives as a girl.

For the Federal Way mother of four, there was never a question about supporting and accepting her transgender daughter, who turns 6 on Saturday.

“I was putting her to bed one night and she said: ‘Mommy, why did God make me a boy? I’m really a girl,’ ” Trainer, 39, recalled. “I told her God doesn’t make mistakes. I promised her that her dad and I would help her be her true self.”

It turns out that probably was the best approach, according to a new study by University of Washington researchers published Friday in the journal Pediatrics.

In a first-ever look at mental health among transgender children, Kristina Olson, a UW assistant professor of psychology, found that such kids with family support had normal levels of depression and anxiety — similar to typical children.