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When there are two children, one girl and one boy, in a family are girls more often the oldest? If so what causes this?

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    $\begingroup$ The chances of giving birth to a boy or girl is roughly 50:50 with a slightly higher chance for boys (scientificamerican.com/article/is-a-pregnant-womans-chan), despite some genetic or environmental factors slightly shifting this ratio for some people. Why would you assume that there is a higher chance of first born females? Can you give any sources/reasons why you are asking this question? $\endgroup$ – Frieke May 11 at 18:46

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