Normally, the CRL of the embryo (measured from the skull to the end of the spine) is 2-4 mm in the sixth week of pregnancy. At this stage, the embryo grows at a rate of 1 or 2 mm per week. It is still very small and, even so, it already has a heart and it begins to pump its blood.
How long is the embryo at six weeks pregnant?
By Zaira Salvador B.Sc., M.Sc. (embryologist).
Last Update: 10/05/2017
Bachelor's Degree in Biotechnology from the Technical University of Valencia (UPV). Biotechnology Degree from the National University of Ireland en Galway (NUIG) and embryologist specializing in Assisted Reproduction, with a Master's Degree in Biotechnology of Human Reproduction from the University of Valencia (UV) and the Valencian Infertility Institute (IVI)