DescriptionPregnancy of crown-rump length of 5.3mm (6 weeks 1 day).gif
English: Vaginal ultrasonography of a gestational sac (with its fluid showing as black in the image because it's anechoic). A human embryo is seen to the right, having a crown-rump length of 5.3mm, corresponding to a gestational age of 6 weeks and 1 day according to local reference data. There is a spherically shaped yolk sac just to the left of it. Fetal heartbeat is discernible in the center of the embryo as a flickering area.
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