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Lab Notes: Why some mums have all boys or all girls

14 min•22 juli 2025

If you've given birth to three daughters, what are the odds that your next child will also be a girl?

One in two, right? Well … maybe not.

The odds of having a fourth girl could be a fair bit higher than 50 per cent, according to a new study into families with single-sex sets of siblings.

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