According to the many-worlds hypothesis, there's a virtually infinite amount of alternate realities, one for every choice every human took, yes?
Meaning that every time I choose not to brush my teeth, a new world comes to reality.
Meaning that, in this infinite quantity of worlds, the must be one where I was born the opposite gender, yes?

Suppose I'd find a way to traverse the barrier and find a new world of these, specifically one where I'm of the opposite sex.
Suppose I meet myself and unknowingly have sex with my opposite-gender self and impregnate her.
We decide to let the fetus become a baby.
Is that baby a complete clone of myself, or of her if it's a female?
Or would it just roll the same dice twice instead of rolling two different dices in the biological formation?

Would it be as if I had a baby with my sister, due to our biological signature being exact the same, the baby would be born completely bonkers?
Theoretically, what would happen?