Bear in mind: I find the link nothing more than Horse ****. But from the comments section;
...If you have a look at my FB page, you'll see I've been trying for some time to make people aware about exposure to synthetic female hormones (estrogens and progestins, drugs that are often used in high risk pregnancies to reduce the likelihood of a miscarriage or premature birth), as a cause of intersex-related abnormalities and transsexuality in the exposed male offspring.
Estrogens and progestins are both highly effective at suppressing testosterone production in adult men, and they appear to be able to cross the placenta and have similar effects on a male fetus, with disastrous consequences. For as long as testosterone production continues to be suppressed, the fetus develops as female instead of male. Because genital development has already finished by the end of the first trimester whereas these hormone treatments are usually only used after the pregnancy is well established, the hormone exposure tends to mostly happen too late to have much effect on the genitals, and it's the brain that bears the brunt of the effects instead. The result is that you end up with people who are genetically male and look male, but have brains that have, to varying degrees, developed as female instead of male...
(DES is an artificial oestrogen hormone given to pregnant women)
There was a study published about 10 years ago in which 150 out of 500 DES sons in the study group had a female gender identity, and in which found a considerably higher incidence than normal of hypogonadism and intersex-related genital abnormalities. I don't have a link to hand, but the authors were Drs Scott Kerlin and Dana Beyer. There was also a study published recently by an organisation called Hhorages France, which found high rates of serious mental illnesses and suicides among children who were exposed to synthetic hormones (estrogens and progestins) in the womb, along with a high incidence of physical intersex-related abnormalities too. I suspect that probably a lot of the kids in that study were actually trans, except France is one of these places with a very macho culture and so nobody wanted to admit it.
There may not be any papers linking cause to effect, but the science here looks plausible at least