5 week fetus picture

At this time, the fetus grows to 0.4cm and looks more like a small seahorse. This week, the fetus has entered the IVF embryonic stage. It is now composed of three germ layers - ectoderm, mesoderm and endoderm. These three germ layers will form the baby's internal organs and tissues in the future. As the IVF embryo develops, the amniotic cavity will expand relatively. During this week, the fetus's primitive cardiovascular and cerebrovascular diseases appear, and heart palpitations will occur. At this time, the human eye cannot identify the gestational sac, but it can be seen from B-ultrasound that the gestational sac occupies less than 1/4 of the uterine cavity.

The germ cells have already disintegrated to form important internal organs of the fetus (such as kidney function and liver), and neural tube defects have also begun to develop. Neural tube defects are caused by the disintegration of the upper layer of the IVF embryo, the ectoderm, which will form the baby's human brain, spinal cord, nerves and spine. The ectoderm will also form the baby's skin, hair, nails, mammary glands, sebaceous glands and tooth enamel. The fetal heart and respiratory tract are initially formed by the breakdown of the mesoderm.

In fact, at this week, the baby's little heart has already begun to divide into ventricles, started to beat, and can pump blood. The mesoderm will also break down to form the baby's muscles, cartilage, bones, and subcutaneous tissue. The third layer, the endoderm, will form the baby's lungs, gastrointestinal tract, early urinary system, as well as thyroid gland, liver and pancreas. In addition, the initial form of the test tube embryo and fetal umbilical cord that transports nutrients and oxygen to the fetus has already started working.

1. Pregnancy test strips: Your pregnancy has entered the fifth week, but you may have only just discovered it now because you are forgetful. Are you pregnant? Your first clue might be to test yourself at home with a pregnancy test. At this time you need to master the appropriate testing methods and methods. In addition, the pregnancy test strips are only used as a preliminary screening test. The pregnancy test strips may produce positive or false negative results, so you cannot trust it too much. The most accurate way is to go to the hospital for examination.

2. Be alert to threatened miscarriage: miscarriage is very easy in the early stages of pregnancy. You should pay attention to getting more rest, not overwork, not transporting or lifting or doing strenuous exercise, and try to reduce the number of times you go out. If vaginal bleeding occurs along with mild abdominal pain and backache, go to the hospital for examination.

3. Early pregnancy reaction: From the beginning of this month, you may feel nausea and vomiting, vomiting after waking up, loss of appetite, etc. You can hold some ginger in your mouth, make tea with tangerine peel, or take appropriate amounts of vitamin B26, all of which can help relieve morning sickness. This type of early pregnancy reaction will generally disappear slowly around 12 to 14 weeks. You should relieve stress and there is no need to have a heavy psychological burden.