The development of a human fetus changes by weeks or even by days. It is not possible to provide a detailed description of the appearance of a human fetus, because it changes as the different parts of the organism develop.
At 4 weeks, it begins to develop the structures that will form its face and neck, but it does not look like a baby yet. At 8 weeks, it is more or less half an inch in size and, by week 12, it measures about 2 inches and the sex organs start to become clear.
For more details, see also: The stages of pregnancy.
Read the full article on: What’s the Difference Between Zygote, Embryo & Fetus? ( 33).
Andrea Rodrigo
B.Sc., M.Sc.
Bachelor's Degree in Biotechnology from the Polytechnic University of Valencia. Master's Degree in Biotechnology of Human Assisted Reproduction from the University of Valencia along with the Valencian Infertility Institute (IVI). Postgraduate course in Medical Genetics.
