Nub理论是首先从英国开始流传起来的，实际上Nub就是胎儿的 生殖节，一般在胎儿11-13周的时候，两腿之间的生殖器部位开始发育，这时候的男胎儿和女胎儿的生殖节从外表上来看其实都是一样的。

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When your baby’s nub (genital tubercle) is forming and visible around 12 weeks, the angle of the dangle can assist in predicting the sex of your baby. What is a nub? Before about 15 week gestation, both males and females have genital tubercles, also known as a nub.

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2022年9月28日 · nub点指的是nt检查图片上，胎儿双腿间接近屁股的位置，可以从图片中明显看出有一个小尾巴的东西凸出，据说可以根据这个肿块看胎儿的性别，此有很多的孕妇在nt图中寻找nub点来判断宝宝的性别，但实际上只是成像角度导致的，不管是男胎还是女胎都会有nub点。

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A nub (phallic tubercle) is your baby's forming genitalia, the body of tissue present in the development of the reproductive system that will either form the urogenital fold (developing labia), or the labioscrotal (developing scrotum).

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In this guide you will learn all about Nub Theory examples, the science behind it, examples you can see on real ultrasounds and how accurate it is, helping you to determine your babies gender more accurately than many other prenatal methods.