What is a germ?

Embryo is the shape of the early fetus, in the first month of pregnancy is the embryonic bud period, different stages of pregnancy during the embryonic bud size is also different, about four weeks of pregnancy when the embryonic bud will be about 0.2 cm, five weeks of pregnancy will be about 0.4 cm, to 40 days to 50 days of pregnancy will form embryos.