4. Fetal Heart Rate
A fetus’ heart will start to beat at around 6 weeks of age. It’s usually between 140 and 170 beats per minute, by week nine.
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One myth suggests that the slower the heart rate, the more likely the fetus is to be male. Supposedly a heart rate under 140bpm indicates this.
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However, a 2006 study found there to be no significant difference between the heart rates of males and females in the womb.
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