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A Study Of Nearly 730,000 Births, Btw 1967-1978, Including 13,800 Twins, From Norway, Is Indicating That Females In Female-Male Twins Are Less Likely To Achieve Social Economic Success Than Females In Female-Female Twins. And This May Be Linked To Prenatal Testosterone In Female-Male Twins. But The Mechanism Is Still Uncertain.

Girls who share a womb with boys tend to make less money than those with twin sisters | Science | AAAS

https://www.sciencemag.org/news/2019/03/girls-who-share-womb-boys-tend-make-less-money-those-twin-sisters

Provocative study looked at more than 700,000 births over more than a decade