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How the placenta develops

Your body is pretty clever. Not only does it grow a whole baby when you’re pregnant, but it also grows you a whole new organ: the magnificent placenta.

At the very beginning of your pregnancy, your embryo gets its nutrients from a yolk sac. Around week ten, the outer layer of the amniotic sac has formed into the placenta, and this placenta can take over the responsibilities of the yolk sac. The placenta will transfer nutrients and oxygen, remove waste and build immunity for baby. In fact, around the end of the first trimester the placenta takes over the production of the progesterone and hCG hormones too, which is why morning sickness usually dissipates around this time… hurrah! 🎉

By around 18 to 20 weeks pregnant, your placenta is fully developed. But as your baby grows, it will continue to grow too. By the end of pregnancy, most placentas weigh in at around 0.7 kg. That’s about seven to 10 apples! 🍏