This ball of cells attaches itself to the uterine wall, where it begins to gain all of its vital nutrients from. This is known as plantation. Once this process occurs, the embryonic stage begins and continues up until the beginning of week 9. During the embryonic stage the eyes, nose, ears and mouth begin to develop, followed by arms and legs. Once week 9 is reached, the baby transforms into a fetus. Once in the fetal stage, the baby will start to develop its sex organs, bone and muscle formations, reflexes, and movement.
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Artificial Intelligence. Cloud Computing. Data Science. Angular 7. Machine Learning. Data Structures. Operating System. Computer Network. Compiler Design. Computer Organization. Discrete Mathematics. Ethical Hacking. At the end of the 8th week after fertilization 10 weeks of pregnancy , the embryo is considered a fetus. During this stage, the structures that have already formed grow and develop.
The following are markers during pregnancy:. By about 16 to 20 weeks: Typically, the pregnant woman can feel the fetus moving. Women who have been pregnant before typically feel movements about 2 weeks earlier than women who are pregnant for the first time.
The lungs continue to mature until near the time of delivery. The brain accumulates new cells throughout pregnancy and the first year of life after birth. As the placenta develops, it extends tiny hairlike projections villi into the wall of the uterus.
The projections branch and rebranch in a complicated treelike arrangement. This arrangement greatly increases the area of contact between the wall of the uterus and the placenta, so that more nutrients and waste materials can be exchanged. The placenta is fully formed by 18 to 20 weeks but continues to grow throughout pregnancy.
At delivery, it weighs about 1 pound. Merck and Co. From developing new therapies that treat and prevent disease to helping people in need, we are committed to improving health and well-being around the world. The Manual was first published in as a service to the community. Learn more about our commitment to Global Medical Knowledge. This site complies with the HONcode standard for trustworthy health information: verify here.
Common Health Topics. Development of the Blastocyst. Development of the Embryo. Development of the Fetus and Placenta. Normal Pregnancy. Test your knowledge. Abortion is defined as the intentional ending of a pregnancy by surgery or drugs.
If you want to learn about pre-zygote terminology — like egg, oocyte, etc. It continues its journey through the fallopian tube towards the uterus, and divides in two yet again. Questions to ask your doctor at every stage of IVF treatment: free downloadable guide. This downloadable guide contains questions that will help you understand the process better, get the answers you deserve, and feel more in control of the situation and your rights as a patient. The embryo is now referred to as a blastocyst.
This means that all the stuff mentioned above will have happened in the lab rather than in your fallopian tube, and then the blastocyst will be transferred directly into your uterus on day 5.
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