>I want links or something talking about the biological or genetic or whatever it may be, that suggest this is something your born with.
The most convincing theory I have heard is that transgenderism results from some sort of cross sexing between the brain and different parts of the body, possibly due to hormone fluctuations effecting the developing brain. MRI scans of pre-hrt trans people show that they have a brain more similarly sexed to someone of the opposite gender, however different studies on this very in results. There is also other things like trans women have a 2:4 digit ratio (length of second to 4th fingers) that is more similar to cis women than cis men, which indicates low testosterone. I may add some links later.
>The acceptance of gays in the last few decades is largely due to prove it is natural across the animal kingdom.
I think that's an important part of it and yes I get your point.
>If it can't be acquired post birth I need to see why.
My point was it appears to be something present from birth and to my knowledge there have been numerous attempts over the decades to postulate transgenderism as something acquired or a result of pathology, all of which have been proven incorrect. As far as I am aware there is 0 evidence that transgenderism can be acquired after birth, unless you have evidence to the contrary?
some effects are semi permanent like you might be left with breast buds if you stop taking estrogen or body hair if your stopping testosterone. If you're transfemale and you have a low testosterone for a long enough time, than you may become infertile.
Yeah these are all really good points