Is it right to allow children to determine their own gender?

God don’t make mistakes.  Whatever gender a person was born as, that’s what they were meant to be, and despite anything they think, feel or do, they will always be truly that gender that they were born, but to answer your question…No,
it is not right to allow children to determine their own gender.
Children should be told to accept who they really are.  Not judging anyone, for I’m not God, but just sharing my personal opinion.