Boy or girl?

Is the Ramzi theory accurate for predicting gender?

Checked against the sources listed on this page. Not reviewed by a clinician. Last updated 5 November 2026. How we check.

Myth

Not reliably. The Ramzi theory guesses the sex from which side the placenta is on at about 6 weeks, and we found no peer-reviewed study that confirms it works.

The idea is that a placenta forming on the right points to a boy, and on the left to a girl. It’s popular online, and it’s easy to see why people want it to work, because it promises an answer very early.

If you want to know the sex early and reliably, NIPT is the most accurate option from about 10 weeks. It’s a blood test and is offered differently in different countries.

References

We found no study that tests this directly, so this answer rests on general biology and the lack of evidence for the claim.

Related weeks

Week 6Week 9

More boy or girl? myths

Myth

Does carrying high mean a girl and carrying low mean a boy?

No. The shape and height of a bump depend on your muscles, body shape, how many pregnancies you’ve had and the baby’s position, not the baby’s sex.

 Myth

Does a heart rate over 140 mean it’s a girl?

No. Studies comparing early heart rates in boys and girls found no meaningful difference. Heart rate depends mostly on gestational age.

 Partly true

Does bad morning sickness mean you’re having a girl?

There’s a small statistical link between severe sickness and girls, but it can’t predict the sex of any one baby.