How does ultrasound check 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-mode ultrasound has a certain degree of error in identifying fetal gender. During the examination, it is necessary to find the correct section, and it requires an experienced doctor to make a judgment. Generally, non-medical professionals or staff who are not specialized in ultrasound rooms may not be able to make an accurate determination.
Generally, males can be identified by observing the scrotum, while females can be identified by seeing three bright lines. It is important to maintain a balanced diet, enhance nutrition, and practice good prenatal care. Regular check-ups, avoiding cold exposure, and avoiding staying up late are also essential. Pay attention to hygiene.

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