One of the most anticipated moments in pregnancy is learning the sex of your baby.
The theory suggests that:
The ultrasound poses no risk to the mother or baby.
Accuracy of Ramzi Theory
Proponents of the Ramzi theory suggest there is a high accuracy rate.

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However, the accuracy of the Ramzi theory is not proven.
Fetal sex organs begin developing around nine weeks' gestation.
It takes about a week to get the results.
Ultrasound
Ultrasound is another option to reliably tell the sex of a baby.
Pregnant people normally have an anatomy ultrasound at 20 weeks' gestation.
While neither test is a foolproof way to detect gender, they are highly reliable and well-regarded among gynecologists.
Summary
The Ramzi theory is not a proven method of determining the sex of your baby.
2017;4(3):125-130. doi:10.17294/2330-0698.1454
Cleveland Clinic.Fetal development.
American Academy of Obstetricians and Gynecologists.Prenatal genetic screening tests.
Cleveland Clinic.Ultrasound in pregnancy.