Stress in females creates hormonal responses that tilt the odds toward female births. Apparently stress alters hormonal levels making it more difficult for sperm carrying y chromosomes to make it through cervical mucus to reach an egg. Sperm carrying x chromosomes are more efficient at navigating the obstacle.
So a man may be quite stressed without affecting at all the odds for birth of either a boy or girl so far as present knowledge goes.
https://neurosciencenews.com/stress-fetal-gender-18183/
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