Fetal circulation
（重定向自Fetal circulatory system）
![](/Images/godic/202501/13/2916_Fetal_Circulatory_System-023436.jpg")
![The dynamics of the fetal circulation can be visualized by obstetric ultrasonography, such as on this embryo of 8 weeks.](/Images/godic/202501/13/8w3d_with_umbilical_cord3436.gif")
![](/Images/godic/202501/13/Embryo_at_5_weeks_5_days_with_heartbeat3436.gif")
The fetal circulation is the circulatory system of a human fetus, often encompassing the entire fetoplacental circulation which includes the umbilical cord and the blood vessels within the placenta that carry fetal blood.
The fetal circulation works differently from that of born humans, mainly because the lungs are not in use. Instead, the fetus obtains oxygen and nutrients from the mother through the placenta and the umbilical cord.