how accurate is HB in determining sex?

tsharpe2 · August 2009

Well, i'm a little early here (still in first tri) but I was wondering for you mommies who know the sex of your LO - is it true that the HB is faster for baby girls than for baby boys?

i heard that 150 and above means a good chance of the baby being a girl and if below 150, good chance of the baby being a boy. My LO's bpm was 167 this morning and for fun i was wondering how accurate that is by doing an informal poll here.

TIA!

Tinkx123x · August 2009

It isn't very accurate at all. The HB changes the entire time your preg based on many things.

wpowell · August 2009

Its a wives tale but it was true for us. My LO's heartbeat was 163 and we're having a girl.

Chaneltara · August 2009

Yeah I heard that (the wive's tale) it is a girl if over 150, a boy if under 150.

Mine was 184!!! (Then 175, then 168, and at the last appt, 160)

And yeah it's a girl!

B!tchBeckman · August 2009

It's an OWT-

JinglesChic · August 2009

At my last check up last week my OB said I'm showing all the signs that LO is a girl (he's been saying since he first heard the HR with a doppler at 8 weeks). I told him we have a money shot u/s pic that leaves no doubt LO is a boy. His HR is always around 156, so in my case it's completely false.

hisprincess06 · August 2009

It's about %97.6 accurate. Stick out tongue

FWIW my LO's HR has always been between 140-150 and we are having a girl.

Celiarh1 · August 2009

As I was told its just an old wives tale! lol My lo is definately a girl and has always had what they said was a low HR. I have also herd that boys HR drop closer to delivery.

vernab · August 2009

Usually all the heartbeats start out high. At 10 weeks the baby's was 164 and then almost every time after that it was 150 or higher until after my 20 week ultrasound, that's when it started to go down. Every time after that it's been about 140, and we are having a boy.

woolgathered · August 2009

My boys' was in the 160s-170s pretty consistently. So, not true for us.

smaher · August 2009

Like previous posters, its not accurate. My hb measurements have been 165, 171, and 156...we're expecting a boy.

tsharpe2 · August 2009

hisprincess06:

It's about %97.6 accurate.

haha, thanks!

my LO's heartbeat has varied between 165 - 167 the few times i've been lucky enough to hear it, and though its an OWT, it did prove true among my group of friends w/babies, so i thought i'd try it out here.

thanks, ladies! i will be joining you here soon!

Mrs.Wifey318 · August 2009

It wasn't accurate at all for me.

S/Cambio · August 2009

We're having a girl. The HB was 172 and 156.

whit022109 · August 2009

james has been 150+. not true for us!

epphd · August 2009

Not at all:

https://www.ncbi.nlm.nih.gov/pubmed/16354993

Gender-related differences in fetal heart rate during first trimester.

McKenna DS, Ventolini G, Neiger R, Downing C.

Department of Obstetrics and Gynecology, Wright State University, Dayton, OH 45409-2902, USA.

OBJECTIVE: Many expecting parents wish to ascertain fetal gender early in pregnancy. Our goal was to determine whether fetal heart rate (FHR) of males and females during the first trimester is significantly different. MATERIALS AND METHODS: From November 1997 to February 2003 we enrolled pregnant women with singleton gestations who underwent obstetric sonography at less than 14 weeks of gestational age. Indications for the sonographic study included first-trimester bleeding, uncertain gestational dating, poor obstetrical history, and aneuploidy screening by nuchal translucency. The sonographic studies were performed by a single sonographer and reviewed by the first author. The FHR was determined by m-mode. All subjects underwent second-trimester sonography at 18.0-24.0 weeks' gestation by the same team, and fetal gender was recorded. Multiple gestations, miscarriages and pregnancies with uncertain fetal gender were excluded. Sonographically assigned fetal gender was confirmed at delivery. RESULTS: Of the 966 first-trimester studies performed, 477 met the inclusion criteria. Of these, 244 (51%) were female and 233 (49%) were males. There were no statistical differences in mean maternal age, gravidity, parity, and mean gestational age at the time of the first study (9.0 +/- 2.3 weeks for female fetuses and 9.0 +/- 2.3 weeks for males, p = 0.7). The average female FHR was 151.7 +/- 22.7 bpm and male FHR was154.9 +/- 22.8 bpm (p = 0.13). DISCUSSION: Contrary to beliefs commonly held by many pregnant women and their families, there are no significant differences between male and female FHR during the first trimester. (c) 2006 S. Karger AG, Basel

cjo · August 2009

Not accurate, the HB fluctuates in different points of gestation. In my first tri my last HB was 158 and today at my 2nd tri anatomy US baby was 138 and it's a BOY!

Max'smom · August 2009

The OWT was not true for us. Our baby's HR has always been above 160 and he was clearly a boy.

Breezie17 · August 2009

While it is an OWT, it was accurate for me both times.

ablou · August 2009

I'm gonna go out on a limb and say 50/50

kellmo · August 2009

My baby's HB was always in the 160's and we are soooo having a boy! So wasn't true for me BUT the bump's chinese gender chart was correct. Also, the myth about carrying low= boy and carrying high=girl was true for me. My baby boy lays really low.

ArmyWife123 · August 2009

ive been told its actually semi accurate (tho completely an OWT) however generally hb doesnt settle down until after week 16... so prior to that i would think its not very accurate at all.... all babies are supposed to be high in the first tri.

my last appt the hb was at 150-160 and the ob said 'oh i think we found the lil girl....' then commented that most times its pretty close to accurate that shes seen...

kiki4 · August 2009

It's not accurate at all. My LO has consistently been between 145-165 and he's all boy. On the flip side, the doctor told my mother through out her entire pregnancy with me that I was a boy because I had a slow heartbeat. Needless to say, they were quite surprised to find out I was a girl.

lovebug630 · August 2009

It's not accurate. I think it's an OWT.

mrs_sherod · August 2009

It's not reliable at all. Also as pp said, it really depends on the baby. My baby is realy active so always has a high hb.

brandiemperdue2 · August 2009

it is not very accurate at all, my babies heartbeat is always between 130-138 and i am having a girl. also 98% of all the old wives tales told me i was having a boy, so i was a little excited and found out we're having a gril (which is still wonderful of course). You have a 50 50 chance lol.

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how accurate is HB in determining sex?

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Gender-related differences in fetal heart rate during first trimester.

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