How does ultrasound check the gender?

Patient's question:

I am already three months pregnant. Every time I have an ultrasound, I ask the doctor if it's a boy or a girl. How can an ultrasound determine the gender?

Doctor's answer:

B in identifying the gender of a fetus has certain errors, and during the examination, it is necessary to find the correct section. Experienced doctors are required to make a judgment. Generally, non-medical workers or staff who are not professional B room workers may not be able to make a judgment.
Generally, males can see the scrotum, while females can see three bright lines. During pregnancy, it is important to maintain a reasonable diet, enhance nutrition, and practice good prenatal care. Regular check-ups, avoiding colds, and not staying up late are also important. Pay attention to hygiene.

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