Are summer pregnancies more likely to result in twins?

There are several studies that have sought to determine a relationship between twin birth rate and the season of birth. Other studies have examined the effects of temperature on human fertility. When you look carefully at all of these studies, there is a slight but statistically significant tendency for conceptions that occur in summer to result in twins.

Some think that this is a result of sunlight stimulating the hormone FSH in women, which in turn increase the likelihood of a multiple birth.

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"Are summer pregnancies more likely to result in twins?" was posted on Friday, January 25th, 2008 at 3:07 am.