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How Can You Tell If You're Having a Boy or a Girl Baby?

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An ultrasound performed between weeks 18 and 20 of a pregnancy can provide 80% to 90% certainty of a baby's sex, explains WebMD. Amniocentesis and chorionic villus sampling (CVS) are also highly-accurate, but more invasive and typically used only when there are concerns of genetic disorder or chromosomal abnormality.

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Another accurate method of establishing the sex of a baby is a DNA test of the mother's blood, but this is prohibitively expensive for most laboratories, says WebMD.

One myth suggests that if the pregnant woman's belly is low, the baby is a boy, and female if she is carrying high. However, no scientific evidence supports this belief, states WebMD.

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