Gender ≠ Sex

Oddly I think parties like this would be more beneficial to the child.

If my parents had thought to have a joint mobility party for me, then maybe my hip joint deformity would have been found in infancy, when it's treatable, and not when I was 17 after years of being told I had "growing pains".

Some people push it like that, but that's not really what the observation is about. It's meant to highlight that it's not preordained. Life is mostly made up and we should learn to acknowledge that openly. Especially when aspects of that made-up-ness actively oppress people

What bothers me is when people use that argument to advocate for replacing 'constructs' which evolved more or less naturally over tens of thousands of years, even before the dawn of civilization, with something deliberately engineered by individual humans. Is a cis-normative nuclear family the only way that it's possible to live? Of course not, but it's also what the vast majority of the population wants in their lives, which is why it's the standard.

Yeah let's reveal your child's genitals.. doesn't have the same ring to it

Oh! I'm going to present the following in good faith.

You're referring to sex. Sex is biological, gender is a concept. Sex is related to your hormones and your healthcare and what's in your pants, but the idea of masculinity or femininity being tied to specific behaviors or clothes is a social construct. (Gender.)

IE; I'm a woman. Very much a woman. Super secure in that. I've got all the parts, enjoy having them. When I go to the gym or when I drink my cousins under the table or when I work on a car, those things shouldn't be tied to an idea of being masculine, because I'm not suddenly more masculine for doing them. I'm definitely still a woman the whole time. That's the difference here, is that there's a concept of gender which is different than sex.

Wow careful with that logical thinking buddy, we don't like that here \s

The anthropologist might see skeletal differences but they'd also pay attention to the manner in which the subject was buried or what possessions survived with them that could also serve as clues of the subject's identity in life.

Humans have sexual dimorphism, but it's a cultural thing that women wear skirts and men drink themselves to death instead of talking about their problems (both of these are jokes btw. I have a friend who wore kilts quite often and my mother drank herself to death)

Also, genetics is tricky, there a plenty of examples of people who do not fall into one category or another for these sexually dimorphic traits. There are people who have genetics from both sex, as well and differences in hormones distributions will causes these traits to appear or not appear.

Is a huge grey area.

You're confusing sex with gender