Can someone explain the Nub Theory to me?
I've never heard of this theory... Is this a nub in this ultrasound under the baby's leg? I've never seen that before on my other kids ultrasounds? 🤔🤷
13 weeks exactly...
![](https://asset-cf-cdn.glowing.com/forum/topic/b6abe6bdbf37c5b574d26be7600f6c70.jpg)
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