When a woman carries twins, with one male fetus and one female fetus, there seems to be a risk for female fetus. The female is often born with reduced chances of conceiving and delivering offspring herself when she grows up. This raises the question, does the sexual development of the female fetus affected by the male hormones from the sibling? Does this increase the probability of the female developing transgender issues?
Are there treatments that would reduce the chances of conceiving twins?
These questions are socially important.
Srinivasan Ramani
In our community populations, fertility is higher in female of twins pregnancy regardless of the second twin gender.
We need to exclude other factors before going with your theory;drugs and environmental factors during pregnancy, age of offsprings at first conception and other confiding factors.
You may find this article relevant:
Hayman J, Fortune DW. Sexual Orientation in Twins: Evidence That Human Sexual Identity May Be Determined Five Days Following Fertilization. Cureus. 2023 Dec 30;15(12):e51346. doi: 10.7759/cureus.51346. PMID: 38161549; PMCID: PMC10757681.
Pubmed reveals that the research on a small sample showing decreased fertility in male/ female twins was disproven when the study was repeated .
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