I always thought the increased winter pregnancy rates I see in clinic were the results of cold weather causing couples to snuggle up more but research just released in the American Journal of Obstetrics & Gynecology reveals that sperm quality really does increase in winter.
Researchers studied over 6,470 sperm samples from men who had been referred to a fertility clinic and found that men with normal sperm counts averaged 71 million sperm per ml in spring and 64 million per ml in autumn. Interestingly, the percentage of fast moving sperm, the ones that increase chance of fertilisation, was highest in winter. The highest percentage of normal sperm morphology was also seen in winter. This certainly correlates the slightly higher birth rate in Autumn!
If you missed a recent blog about how watching 20 hours of TV per week can reduce sperm count by 44% then read more here
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