This article is based on Superman Vision.
The head circumference is measured along the outer edge of the skull, and the double top diameter is inside to outside! Pay attention to the transparent compartment and the friendship relationship side by side with the front corner, although there are feelings, but it is a passing!
Abdominal circumference is measured along the outer edge of the skin, not along the outer edge of the ribs!!
3 markers: stomach, umbilical vein, portal sinus
When the heart is four chambers, pay attention to the fact that under normal circumstances, the descending aorta is located at the left third of the posterior side of the left atrium!!
If you're on the right, think of the right aortic arch.
The right aortic arch article is derived from Superman Vision.