An adaptive significance of morning sickness? Trivers-Willard and Hyperemesis Gravidarum
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d="p0005">Morning sickness is common in early pregnancy but is of unknown aetiology.

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d="p0010">Its severe form, Hyperemesis Gravidarum (HG), requires hospital admission.

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d="p0015">Using Swedish register data, we show that HG is more common among low education mothers.

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d="p0020">We confirm a strong girl bias among live births following HG in pregnancy.

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d="p0025">HG may be a proximate mechanism for the so called Trivers&ndash;Willard hypothesis.

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