Here's a quick overview of the problems with various answers:
1) Birth. [..] It's obviously a silly answer if you give it a little thought and it contradicts reality in a spectacularly obvious way. [..] Everybody is born as a baby. If you want to remain consistent with your obviously wrong argument that everyone is always the same as they were when they were born, you must argue that everyone is always a newborn baby for all of their life. It's a spectacularly ridiculous line of argument to be making.
So unless you can come up with a good reason why you use that definition, it's clearly just wrong and silly. A person in adulthood is not the same as they were when they were born.
What is spectacularly ridiculous is you attempting to draw comparisons between a baby growing into an adult with a male magically transforming into a female
I hope you do realise how absurd and in fact downright embarrassing your comparisons are?
Unfortunately it does not work that way in reality where I suggest you return to.
If you class them as not women, then you either have to ignore reality (usually by claiming that everyone always remains the same as they were when they were a baby) or define "woman" in a way that excludes some adults who have always been female (e.g. by defining sex by primary sexual organs, which some people have removed for medical reasons).
Oh dear, the irony
The actual real life reality is: -
A) You have a man who has had his penis chopped off
B) You have a man who has had what's left of his penis inverted in some strange concoction of blood, stiches, skin, lube and tears shaped into something resembling the physical appearance of a vagina.
C) You have a man who has had his chest filled with silicon implants to resemble something that looks like a woman's breasts.
D) You have a man who has had hormone replacement therapy taking in hormones that are not naturally his or blocking the ones that are.
E) You have a man who has slapped on a bit of makeup, had a shave, and grown his head hair.
F) You have a man who puts on a feminine tone of voice, so to sound more feminine
G/H/I/J etc etc I guess you can see where this is going
So what are we left with?
A man who has done untold damage to his body, that's what you are left with.
Perhaps in your alternate reality this man, by physically harming himself, has magically transformed into a woman. Next week we should perhaps take a cat and shave it, chop off its arms and legs, attach a speaker to make a hissing noise, strap on a child's rattling toy to its tail, and replace its teeth with some hypodermic needles filled with venom and call it a rattle snake?
