What determines pregnancy duration

What is it about?

Human pregnancy duration seems to be determined by uterine size and fetal growth rate: using maternal height as a proxy for uterine size, quasi-experiment shows that twins of short mothers are born earlier than twins of tall mothers. Similarly, we show that the observational effect <maternal height on pregnancy duration> is modulated by fetal growth rate.

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Why is it important?

This study provides evidence that pregnancy duration is determined by both mother (uterine size) and the fetus (growth rate).