What Is the Size of a 12 Week Old Fetus?
At 12 weeks, a fetus may not be big enough to have mommy-to-be in maternity clothes, but the growth and development that occur during the first trimester is the most dramatic of the entire pregnancy, according to the University of Virginia Health System. By the end of 12 weeks, a fetus has all major organs and systems in place, complete with arms, legs, genitals and a beating heart.
