Baby Heart Rate Boy or Girl at 9 Weeks
Oblivious to erstwhile wives' tales
Days until birth: 126
Waist size: 85 centimetres (33.v inches)
Deciding whether or not to find out the sex of our unborn child was a dilemma that plagued us for weeks. Would information technology spoil the surprise? Even without getting a definitive ultrasound exam to tell united states of america the sex, at that place are whatever number of folklore prediction methods – but is there any science backside them?
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Old wives' tale i: Bad morning sickness means you're having a boy
I didn't suffer morning sickness, then according to this rule, I should be expecting a girl.
The opposite is truthful, in fact: mothers with astringent pregnancy sickness are more likely to have a girl. In 1999, researchers analysed records of 8186 women admitted to hospital in Sweden with pregnancy sickness and constitute that 44.3 per cent of them gave birth to boys, versus 51.4 per cent of the general population (The Lancet, DOI: 10.1016/s0140-6736(99)04239-7). They blame higher levels of the pregnancy hormone homo chorionic gonadotropin (hCG) in women carrying girls.
Curiously, Henrik Toft Sørensen of Aarhus and Aalborg Academy Hospitals in Kingdom of denmark wrote to The Lancet the post-obit month claiming that the sex ratio also seemed to be influenced by marital status, with fewer boys born to single mothers.
In a separate study, he also found that women with severe pregnancy sickness were more likely to give nascence to girls; the correlation was even stronger in unmarried mothers. Among women with severe sickness, 46.5 per cent gave birth to boys, compared with 51 per cent of other women. Within the pregnancy sickness grouping, 40 per cent of women who lived lonely had boys, against 45 per cent of women who lived with their partner (The Lancet, DOI: 10.1016/s0140-6736(05)74029-0).
Old wives' tale 2: Fetal heart rate predicts the baby's sex
According to this rule – information technology's been effectually for 30 years, so I course it every bit an old wives' tale – if your fetus's heart rate is above 140 beats per minute (bpm) yous're expecting a girl, and if it's beneath y'all're expecting a boy. I've had the pleasure of listening to my baby'south heart rate twice in the past fortnight, and the final time it was 130 bpm – so I should be expecting a male child.
However, fetal eye charge per unit tends to decrease every bit pregnancy progresses, from 170 to 200 bpm at 8 to x weeks downwards to 120 to 160 bpm by mid-pregnancy. And according to published studies there seems to be footling difference between boys and girls, at to the lowest degree during early on pregnancy.
In one study, researchers used ultrasound to measure fetal heart rate in 477 fetuses before 14 weeks of pregnancy. The average center charge per unit of girls was 151.7 bpm, while for boys it was 154.9 bpm – not a big enough difference to exist statistically pregnant (Fetal Diagnosis and Therapy, DOI: x.1159/000089065).
The only time when a divergence has been detected is during labour itself, when female babies seem to have faster heart rates than males; the reason is unknown.
Old wives' tale iii: Weird food cravings = a boy
One friend told me that my aversion to lettuce means I'chiliad going to accept a male child. I couldn't notice whatever science to support this, simply there is some testify from a Boston infirmary written report that found expectant mothers have bigger appetites on average if they are carrying a boy rather than a girl.
I'yard definitely hungry all the time, but that might just be because of pregnancy in general. The problem is: how do y'all know what constitutes a big increase in appetite? Indeed, the authors of the Boston study admit that the divergence in appetite is not striking plenty to predict the sex of a baby with accuracy.
Old wives' tale 4: Women "only know"
That mysterious thing chosen "female intuition" claims power over many things, including existence able to predict the sex of unborn children. Personally, I suspect it's a cunning tactic for dismissing ridiculous babe names suggested by the male person partner. Having said that, I have been convinced I'm having a girl for some weeks.
In 1998, researchers at the University of Tucson in Arizona asked 108 pregnant women to predict the sex of their infant. Seventy-v of these women claimed to have an intuition near information technology – every bit either a gut feeling or a dream – and of these women, 60 per cent guessed correctly. When women who had a preference for one sexual practice over the other were removed from this sample, however, the 48 women that remained guessed correctly 71 per cent of the time. Unfortunately, the report was never published, making it hard to scrutinise the details.
Besides as all the tales to a higher place, of particular interest to Bumpology is the sociology surrounding the shape of the bump and its relation to the infant'southward sex (Birth, DOI: 10.1046/j.1523-536x.1999.00172.10). But predictions from the bump are no clearer than the other tales, and we decided to plump for a method of sex activity prediction that's 95 per cent certain. We asked the sonographer to tell u.s. if our babe was going to be a boy or a girl during our 21-week browse concluding calendar week.
All the old wives' tales got it incorrect, bar one: female intuition. I'g happy to say that we're expecting a little girl.
Read previous Bumpology columns: Agile fetus, boisterous child? Uh-oh, Why do I loathe lettuce?, How does stress affect my fetus?
More on these topics:
- pregnancy and birth
Source: https://www.newscientist.com/article/dn18827-bumpology-can-old-wives-tales-tell-me-my-babys-sex/
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