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In the second and third trimester of pregnancy head circumference HC , abdominal circumference AC and femur length FL were assessed. From the second trimester onwards, HC and AC were larger in males than in females 0.
However, FL in males was smaller compared to female fetuses 0. Repeated measurement analyses showed a different prenatal as well as postnatal HC growth pattern between males and females.
Conclusions Sex affects both fetal as well as infant growth. Besides body size, also body proportions differ between males and females with different growth patterns.
This sexual dimorphism might arise from differences in fetal programming with sex specific health differences as a consequence in later life. Electronic supplementary material The online version of this article doi Keywords: Fetal sex, Fetal growth, Growth pattern, Biometric indices Background Embryonic and fetal growth are dependent on many factors including adequate placental development and function.
This can be reflected by several placental biomarkers in maternal plasma such as the pro-angiogenic placental growth factor PlGF and the anti-angiogenic soluble fms-like tyrosine kinase 1 s-Flt1 [ 1 , 2 ]. Previous studies have shown associations between placental biomarkers and fetal growth [ 3 — 5 ].
Recently, fetal sex-specific differences in placental biomarkers were observed with higher first trimester levels of s-Flt1 and PlGF in women carrying a female fetus. This may suggest that placentation processes differ according to fetal sex [ 6 , 7 ].
Indeed, previous research has shown fetal sex-specific differences in biometrical indices and growth patterns, and fetal sex-specific growth curves were created [ 8 ]. However, these growth curves were based on cross-sectional data and serial measurements of the same fetus were not available. Moreover, it is of interest to investigate whether sex-specific differences in fetal growth persist into infancy since the Development and Origins of Health and Disease DOHaD theory states that deviations in early growth are associated with adverse health in later life.
With this study, we investigate whether there are fetal sex-specific differences in fetal and infant growth in a large study population.