Fetal sex and the development of gestational diabetes mellitus in gravidae with multiple gestation pregnancies.

While gestational diabetes mellitus is of multifactorial origin, we found a significant association between the fetal sex pairing and the treatment needed for gravidae with twins who develop gestational diabetes mellitus. A higher proportion of female-female twins was associated with gestational diabetes classification A2 compared with male-female or male-male deliveries. Further research on the physiology driving this association is warranted.