Average or normal measurement of a yolk sac


Does anyone know the average or normal measurement of a yolk sac? And does this continue to get larger or smaller as the baby grows?


I don’t know the measurements, but I do know that it gets smaller as the baby grows and eventually disappears after the placenta develops because it’s not needed anymore. With my twin that we lost, they were saying that the yolk sac was larger than it should be which usually means the pregnancy is not viable, and they were correct. Good Luck!