When Is the Placenta Formed?

The placenta is an organ by which an unborn baby gets its nourishment. The placenta attaches to the uterus and delivers oxygen and nutrients to the baby. The placenta also helps protect the fetus and aid in the labor process. The placenta is fully formed by about the 18th week.

  1. After Fertilization

    • About one week after fertilization, the placenta begins to form along the uterine wall.

    Embryo

    • Three weeks after fertilization, the heart begins to pump fluid through the blood vessels, which continue to develop in the placenta.

    8 Weeks

    • At about week eight, tiny hair-like structures on the placenta, called villa, start to weave between the uterine wall, strengthening the attachment to the placenta and allowing more nutrients and waste to pass through.

    18 Weeks

    • Between Week 18 and 20, the placenta is fully formed. However, it continues to grow until birth.

    Birth

    • Following the baby's birth, the placenta is delivered.

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