Theres plenty of mention on here about people such as Lily Maynard who's child was never diagnosed as having gender dysphoria 'detransitioned' so in the interests of balance and discussion, here is an alternative view..
"I understand the scepticism around how biology can be misused, but surely that does not mean this should be rejected outright?
Whilst supporters of trans rights shy away from biology and science, it allows transphobic groups to present themselves as champions of science and rationality. Claims that couldn’t be farther from the truth."
growinguptransgender.wordpress.com/2018/06/04/biological-underpinning-to-gender-identity/