Is it called “embryo” or “fetus” before 12 weeks of pregnancy? Fetal development in the first 12 weeks

Many pregnant mothers see articles or videos about pregnancy and childbirth on the Internet. Some of them talk about embryos and some talk about fetuses. They will be confused: what’s the difference between embryos and fetuses?

in fact, when we first found out that we are pregnant, it is usually about 4-6 weeks. The fetus at this stage can not be called a fetus, it is only a small embryo. When will it become a fetus? What are the developmental processes from embryo to fetus? Let’s get to know.

it takes 40 weeks from the formation of a small recipient egg to the gradual differentiation and development of a fetus, and then to the mature birth. In this 40 weeks, the development of the fetus will go through the following three stages.

because in order to get pregnant, the process of the formation and implantation of the fertilized eggs will first occur. For women who experience regular monthly experience, they will experience the ovulation period after about 14 menstruation. If they share the same room at this time, it is possible that sperm and eggs will meet to form a fertilized egg.

within 7 days after rooming, the fertilized egg will rapidly differentiate and enter the uterus to “settle down”, that is, the fertilized egg will be implanted. Before entering the uterus, the fertilized egg will undergo rapid cleavage to become a “morula”, and the morula will gradually grow into a hollow “blastocyst”.

the blastocyst is divided into two parts: the inner cell mass and the outer embryo trophoblast. With the differentiation and development, the inner cell mass will gradually develop into the fetus, while the ectotrophoblast will gradually develop into placenta and amnion.

these three germ layers will gradually develop into organs, digestive tract and respiratory tract of fetus; kidney, muscle and blood vessels; hair, ears, teeth, nails and nerves.

chorionic membrane: gradually grows into the uterine wall and becomes the fetal membrane, providing continuous nutrition for the fetus; amnion: will wrap the fetus and play a protective role; yolk sac: it will gradually disappear before 12 weeks, mainly before the formation of placenta, to provide nutrition for the embryo. Jingma reminds: generally in the same room 7-10 days later, female hormone secretion will start to increase, fertilized eggs begin to differentiate rapidly, this time go to the hospital to draw blood to check pregnancy, you can see the blood HCG increased.

generally around 7 weeks of pregnancy, fetal heart rate and embryo bud can be seen through B-ultrasound. By the 8th week of pregnancy, the embryo begins to take shape and looks like a “little man”, with head, body and limbs visible. From the 9th week of pregnancy, it officially enters the “fetal period”.

then, in the next 30 weeks, each part of the fetus will continue to develop and mature, and by the time of birth, it will be a “fully functional” and mature baby.

early pregnancy is the stage of fetal differentiation and development. From the embryonic egg stage to the embryonic stage, and then to the fetal stage, not only the limbs of the body will be differentiated and developed, but also the organs will be differentiated and formed, as well as the brain development, all of which are carried out simultaneously.

if there is an error in the process of differentiation and development, and the differentiation can not go on, it may lead to fetal malformation or even stop development.

therefore, early pregnancy is a high incidence of fetal arrest, and pregnant mothers should pay special attention to “avoid exposure to factors that may affect fetal development”, such as various pollutants, chemicals, drugs, etc.

in the early stage of pregnancy, the fetus is still unstable, so the pregnant mother should pay more attention to rest, avoid overwork, doing heavy physical work, lifting heavy objects, strenuous exercise, roommates, etc. large or violent activities may cause threatened abortion or fetal suspension.

if there is already a red situation, you should go to see a doctor in a timely manner, keep the fetus according to the doctor’s advice, and try to stay in bed.

many pregnant mothers have severe reactions in early pregnancy. They begin to have various kinds of discomfort from 5 to 6 weeks of pregnancy. The most serious may be nausea and vomiting. Pregnant mothers with severe pregnancy vomiting can eat less and more meals, and can’t stop eating because of nausea.

in addition, we should pay special attention to two points: first, we should eat some staple food every day to avoid ketoacidosis of fetus; second, we should pay attention to water supplement to avoid dehydration due to serious vomiting.

the hospital’s regular birth examination is done for the first time in the 12th week of pregnancy, that is to say, there is no regular birth examination in the 12th week of pregnancy. Whether or not to check depends on the actual situation of the pregnant mother. For example, if you want to confirm whether you are pregnant, whether there are fetal heart and embryo buds, brown secretions, severe pregnancy vomiting, etc., you need to go to the hospital for examination.

However, regular prenatal examination from the 12th week of pregnancy should also be done on time. It is necessary to monitor the physical condition of pregnant mothers and the development of fetus during pregnancy.

the above is about the division of “embryo” and “fetus”, as well as the differentiation and development of fetus in early pregnancy, and the special precautions for pregnant mothers. Early pregnancy is a high incidence period of fetal arrest and deformity, so pregnant mothers should pay more attention to themselves, and should not neglect it.

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