Week 5 of Pregnancy - FamilyEducation

Week 5 of Pregnancy

First Trimester

Your 5th Week

If you have no period and a positive test result, you're going to have a baby!
5 Week embryo in uterus
Embryo at 5 weeks
7. The amniotic sac is a fluid-filled sac that cocoons the developing embryo.
8. The chorionic cavity surrounds the amniotic sac and is bounded by a membrane called the chorion.
1. The embryo now measures 0.09 in (2.5 mm).
2. A fold down the back of the embryo marks the beginnings of the spine.
3. Chorionic villi reach into the wall of the uterus to form the placenta. The villi contain blood vessels that tap into your body's blood supply to access nutrients for the baby.
4. The umbilical cord connects the baby to the developing placenta. At first it is rather short and has yet to develop any coils.
5. Embryonic tissues are already forming into a structure that will become the heart.
6. The yolk sac nourishes the embryo until the placenta is established and can provide nutrients through its blood supply.
The amniotic sac is a fluid-filled sac that cocoons the developing embryo.The chorionic cavity surrounds the amniotic sac and is bounded by a membrane called the chorion.The embryo now measures 0.09 in (2.5mm).A fold down the back of the embryo marks the beginning of the spine.Chorionic villi reach into the wall of the uterus to form the placenta.The umbilica cord connecs the baby to the developing placenta.Embryonic tissues are already forming into a structure that will become the heart.The yolk sac nourishes the embryo until the placenta is established and can provide nutrients through its blood supply.
When your pregnancy is confirmed, it's natural to experience a mixed bag of emotions-excitement, disbelief, joy, and anxiety. Everything is about to change forever for you and your partner. Give yourselves time to take in the big news. You may not feel pregnant yet, but momentous changes are taking place in the hidden world of your uterus. Step by step, the building blocks of life are being set in place.

You are 4 Weeks and 1 Day Pregnant

Your baby todayThis is a microscope view of the amniotic cavity with the cells that will become the baby in a close-up. These cells will repeatedly divide and multiply, becoming more and more specialized at each stage of their development. read more

You are 4 Weeks and 2 Days Pregnant

Your baby todayThe embryo until this stage of development has consisted of two layers of cells. Now, a third layer starts to become visible as a "bulge" between the two-this bulge can be seen in the center of this image. read more

You are 4 Weeks and 3 Days Pregnant

Your baby todayAs the embryo transforms from two cell layers into three, a groove develops along the back of the embryo. This groove will develop in the embryo's neural tube-the forerunner of the brain and spinal cord. read more

You are 4 Weeks and 4 Days Pregnant

Your baby todayThe embryo seen from above now has a subtle groove (the primitive groove) and a small central depression (the primitive node), both seen here in white. These changes start at what will become the base of the spine and progress toward the head. read more

You are 4 Weeks and 5 Days Pregnant

Your baby todayThe embryo, still less than 3 mm long, now has a deep and narrow groove extending along its entire length. This groove will soon become so deep and its edges will curl over so much that it forms into a tube running along the length of the embryo. read more

You are 4 Weeks and 6 Days Pregnant

Your baby todayThe upper part of the embryo is shown. There is still a wide opening along the back of the embryo that will gradually close over the next few days. The head and lower spine portions are the last to close. read more

You are 5 Weeks Exactly Pregnant

Your baby todayThe bulge at the lower part of this image will eventually become the baby's head. Segments called somites (seen as bright, round areas running down one side of the embryo), which will form the baby's spine, have started to develop. read more