Depends: On what ?S are being asked. Best time to date the age of the fetus is 8-13 weeks. Best time to evaluate the anatomy is 18-22 weeks. As they get older, there is less accuracy, since all fetuses (like their parents) are different. Older fetuses are bigger, so it can be easier to see somethings, but it is more likely some part of the fetus will be in the way of what you are trying to look at.
Answered 12/30/2014
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