“Switch genders” and “changing sex” are not standard terminology, and I don’t know what you mean by this. I’ve asked you repeatedly not to use “sex” and “gender” unqualified, and to use standard terminology to make clear exactly what aspects of those things you are referring to. If you insist on not doing so, please don’t complain that subsequent misunderstandings are “gaslighting”.
“Sex assigned at birth” derives from physical sexual characteristics, sometimes colloquially and loosely referred to as “biological sex”. Obviously so, because babies aren’t at a stage of development where anything is discernable about their mental state.
My understanding of the current state of research is that for most people, gender identity, the internal sense of “who you are as a person” with respect to gender, is firmly established by around age 3. Remembering that “firmly established” is not synonymous with binary or non-fluid, fluidity is a possible aspect of a firmly-established identity. So gender identity is usually not something voluntary or variable past early childhood, and generally “switching gender” is not something that happens.
For someone whose gender identity is not congruent with their sex assigned at birth, they may (to any degree) transition, which means changing any aspect of their body and/or behavioral presentation to align more comfortably with their internal sense of self. If you like, transition involves a change in anything other than gender identity.
Again, I don’t know exactly what you mean here.
To me, the term “woman” denotes an identity, it maps to gender identity, a mental state. You “are” a woman if you have the gender identity of a woman.
The adjective “female” could apply to pretty much any aspect of sex/gender - female sex organs, typically female chromosome configuration, female gender identity, a typically female aspect of gender presentation in a given culture.
Intuitively to me, there’s a distinction between saying “female chromosome configuration”, which I think is fine, it’s just synonymous with “XX”, and indicates the typical state without exclusion of atypical states; whereas saying a woman’s chromosome configuration seems pejorative, because there’s an implication that a person who is not XX is in some sense not a real woman. But that’s just my opinion, an it may be that different usage in technical scientific contexts is appropriate, where in other contexts it’s not.