This is really a hard and heart rending decision. On the one hand I feel very sad for transgender people, but on the other hand, women and girls should not be deterred from entering a sports competition because of the presence of a transgender athlete. 

As for FINA's "inclusionary policy", I agree with the World Professional Association for Transgender Health (WPATH), that requirement is "unethical".  In my own personal opinion no one at  age 12 should be transitioning....it is too young and minds can be changed later in life when it is too late.

So what to do? I don't know...but comments made by Caitlin Jenner (formerly Bruce Jenner, Olympic Gold Medal winner decathlete) make sense. 

https://www.bbc.com/news/world-us-canada-56960011

This is a no-brainer. Males have more muscle mass and even when trying to change gender, those muscles still remain. They may not be as strong as prior to gender change but will still be stronger than women against whom they will compete. This decision has nothing to do with sexism or denigrating those people who want to change gender, it's all about fairness. What is not mentioned is that about 1500 males competing at school level in America can run faster over 100 metres than the women's world record. Similarly a male who was ranked about 800th in the world for swimming over 800 metres as a male changed gender and won the same distance in a woman's race by 8 seconds. People who wish to change gender should be supported but not to the extent where they want to compete against women.

The playing field for sport must be equal for all athletes.  There are some sports, such as equestrian competitions where males and females compete against because of requirements don't rely on genetic factors.  As soon as genetic factors come into play those with male genes have an advantage over those with female genes.   I used to play A grade squash and sometimes I played a female who enjoyed being number 2 in the world for a significant period of time.  I could beat her.  Identifying as a transgender person doesn't result in a gene change and therefore if allowed to compete in female events in serious competition they will have an unfair advantage.  Where sport is being played socially, for example mixed basketball or netball then gender is not an issue.

Elite level sport should be fair and that means unless the sport allows both males and females to compete on an even basis then regrettably those who are transgender should not be permitted to compete in female sport.   If females transition to males then there is no problem with them competing in male sport although they would be at a disadvantage.

I suspect that the option of transgender only sport is unlikely to be viable simply because the numbers of people who could qualify would be too small.

Several week ago I stood beside a lovely transgender lady, who towered over me, and I personally contemplated having to compete with her on any level.   The thought terrified me.  Like so many genetic females I have fought my whole life for equal rights, equal pay, just equality for women, most of which we haven't achieved anyway (and for the past 50 years or so I have also fought for gay rights).  Now , sadly, there is a new battleground, one which I had nothing to do with, where women are again being raged against by those who once were men...  I don't want to fight with you..  I want you to be happy but why do you want to destroy me along the way?   It just doesn't make sense.  The other thing is that there is not now and probably never will be, any discussion about females trans to males athletes.  There is absolutely no where for them to compete now..  Contemplate that outcome.  But perhaps they might get paid equally to males...  Will the trans to females be happy to accept a pay reduction?

If you were born a male you compete as a male. If you were born a female you compete as a female. This back and forward movement should not change anything in the way one competes in ANY sport. A male will ALWAYS be a male and a female will ALWAYS be a female medically speaking. I have yet to see a female boxer come up against a male boxer. END OF STORY!

Commonsense has finally prevailed and hopefully will save woman's sport from total destruction. If you have developed as a man, you are a man, whatever sex you identify as.