The embryonic period extends to the end of the eight week. After the embryonic period (8weeks), the developing human is called a fetus.
For the first 8 weeks the developing human is called an embryo after that it is called a fetus.
The heart is the first organ to develop in a fetus. Together, blood and the circulatory system, that is powered by the heart, form the first organ system.
Embryo
IgM
The Heart.
Footling breech-- A position of the fetus while in the uterus where the feet of the fetus are nearest the cervix and will be the first part of the fetus to exit the uterus, with the head of the fetus being the last part to exit the uterus.
The embryo is the first stage of a baby's life then after 12 weeks it is called a fetus.
The death of an embryo or fetus in the first 20 weeks of pregnancy is called a spontaneous abortion.
when you get done with the first stage
Because when the heart first forms in the fetus, it is swapped around. It first forms with apex on top and during maturity of the fetus it swaps around.
First it's a embryo until the 10th week, after that it's a fully formed but small fetus.