well if we're talking newborn I would freak out the butcher who circumcized me by telling him in perfect english I don't consent to this. I don't know if I could realistically get out of it but I would try.

I would now be a baby with the full knowledge of a graduate engineering degree and several years of industry experience, and the knowledge that I'm a trans woman, bi, and neurodivergent.

School would be a tragically boring breeze, and I would probably try to get into some accelerated "child prodigy" academic program so I could get through it quicker. One of the ones where you start college when other people are starting high school. By this point I would have started male puberty, so priority number one would be to go to the campus doctor and start my hormonal transition. It would frankly be amazing to go through only female puberty, and at roughly the right age even. I could expect to end up much more feminine since the skeletal changes are still possible at that age and I wouldn't have had the full effect of male puberty on my face.

I would take my time at college, still study engineering but make it easy on myself, enjoy being a college girl for a while, have my slut phase while I'm still young. Idk how far I would go with it but I would probably study something new, probably get at least a masters again. A PhD would still be way too much work for me.

After graduating it would just be normal life again, but with the body I've always wanted and a little head start in life, as opposed to being really behind like I am now. Maybe I'd even be treated better by my parents, being born with more emotional maturity than they've ever had, and with a mind even older than they were when I was born. I still wouldn't trust or like them. They'd still be bigots and religious weirdos. But maybe having a seemingly prodigal child who outperforms their wildest dreams might make them at least be nicer to me.