Maternal physical activity affects yolk sac size and growth in early pregnancy, but girls and boys use different strategies.

Notably, the interaction between embryonic sex and daily maternal physical activity was also highly significant (0.24 mm·h −1 ; 95% CI [0.12–0.38]), underscoring the differential effect of maternal physical activity on yolk sac size at 10 weeks’ gestation, depending on the sex of the embryo (Fig. 4 , Supplementary Table S3 ).

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