All human foetuses start off in a female configuration, and in the absence of biochemical instructions to the contrary,
will develop into baby girls—irrespective of their chromosomal sex. This “female by default” development is
overridden in normal male foetuses by a complex sequence of hormonal processes. It starts about six weeks
after conception, when the SRY gene on the Y chromosome causes a weak male hormone precursor to be secreted.

This causes the foetal gonads to differentiate into testes instead of ovaries. Some weeks later,
the primitive testes start working, and secrete a large dose of testosterone (the principal male hormone),
which causes the foetal brain to differentiate into the male pattern. It is at this point that the brain structure
responsible for gender identity, as well as all the other well-known (and measurable) brain differences
between men and women, is laid down.

Transsexualism is caused by that second burst of hormones failing to happen, or only happening very weakly. . .
There are a number of possible reasons for this failure; in some cases, the genitals do not develop normally,
and therefore do not manage to secrete testosterone on schedule to alter the brain. This is likely to produce a certain
degree of physical intersex in the infant as well as transsexualism. Most transsexuals, however,
are not obviously intersexed, so subtler causes must be involved.

Overall, the condition seems to have three possible causes:

1. Chromosomes: . . . A few, but by no means all, transsexuals have a nonstandard karyotype,
leading to hormonal “confusion” during foetal development.

2. Chemicals: some drugs that were administered to pregnant women (most notoriously diethylstilboestrol),
or oral contraceptives unknowingly taken after conception, frequently caused transsexual offspring by
disrupting the hormone processes. There is also increasing evidence that some pollutants can have
the same effect—many man-made chemicals are known to mimic oestrogen and/or disrupt androgen receptors.

3. Random events: sometimes, the biochemistry simply fails to work properly. . .
Perhaps the expectant mother is anaemic or the foetus is undernourished for some reason, or maybe maternal
hormones cross the placenta in sufficient quantity to disrupt foetal development. . . .

. . . Neither upbringing nor cultural influences can change the pre-natal wiring of one’s brain. . . .
Once the relevant stage of pregnancy has passed, there is no way that the foetus’s brain-sex
(and hence gender) can be altered: postnatally, hormones can alter the body, but the brain remains forever
as it was born. This is why it is impossible to change a transsexual’s gender to match their natal sex.
It may seem strange to change someone’s body-sex to match their gender, but it is the only treatment possible. . . .
So gender reassignment (“sex-change”) is the only successful way of treating transsexuals.

So, the question remains, can shemales get pregnant? Is it possible! Get here and find out!

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