Ultra-sound is not 100% accurate because it depends on visual judgement. The only 100% accurate method is amniocentesis 羊膜穿刺術 which 取出羊水進行測試. It usually would be suggested for mom-to-be who is 35 years old or above at time of delivery. By checking the DNA, the gender of the baby can also be revealed. Of course, it's not necessary to do amniocentesis if you only want to know the gender.
Honestly speaking, you cannot change the gender anyway. Knowing in advance would only be convenient for you to prepare the nursery and buying clothes.
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. 我的朋友輩中凡陀b仔的, 都比較早周數, 醫生已大致confirm bb 性別, 因為在u/s中, 實在是多了一點東西嘛
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