The fetal neck translucency \”NT\” in B-ultrasound examination of elderly pregnant women is also called the fetal neck translucency: the thickness of the dorsal neck subcutaneous tissue can be measured in the sagittal plane of the embryo in the early pregnancy, and the horizontal section of the fetal head is used as the standard in the second trimester. . On the basis of the section used to measure the biparietal diameter, tilt the probe from the back of the fetal head toward the foot, so that the cerebellum and cerebellomedullary cistern are clearly displayed, and then measure the distance from the posterior skin line to the outer edge of the skull line. Normally, NT should be less than 3 mm between 10 and 13 weeks of pregnancy, and less than 6 mm after 14 weeks of pregnancy. The interstitial fluid of DS fetuses combines with type VI collagen, and the gene encoding type VI collagen is located on chromosome 21. In DS fetuses, one unit of this collagen is overdeveloped, resulting in an increase in elastic components in the connective tissue, which makes the fetal neck The local skin swells, causing the NT to thicken. It is worth noting that there is an intersection between normal and abnormal NT measurement values, so caution should be used in judgment, especially non-standard sections and measurement errors can easily lead to misdiagnosis. Underwear, Bras and Shoes From the moment you are pregnant, you should wear pure cotton underwear and pure cotton underwear. Wearing a pure cotton bra is to avoid clogging the breast glands. It is best to buy a larger bra and not be too tight. It is best to wear maternity underwear in the third month of pregnancy, the kind that support the belly. It may not be enough to hold up when you first put it on, but it will be very comfortable to wear. Remember to wear something of better quality. After all, there are not many chances of getting pregnant in your life, so why bother yourself. Never wear high heels. Walking in high heels can easily cause fatigue in the legs, especially for pregnant women, as their abdomen continues to grow and their bodies change, making them different from usual. Buy yourself a few pairs of soft-soled shoes. It is recommended that when you buy new shoes, you must glue a new sole to make the soles and heels more non-slip. It is recommended to choose shoes with thin soles, flat soles or low heels, or old sports shoes. They need to be worn for a long time. If the soles are hard, pregnant mothers will be very uncomfortable. By the second trimester, your feet will be larger than before, so you need to leave enough room. Will radiation from TVs and computers affect the fetus? According to research, the radiation exposure received by watching TV is lower than that of sunbathing, and the energy received by the fetus is almost zero. Some people once believed that computer operators had a higher miscarriage rate, but recent statistics have found that using computers does not increase the probability of miscarriage. However, in order to ensure good health and good health, women should not perform intense computer operations for a long time and continuously during pregnancy. It is very important to take appropriate rest and light activities. Sitting in a fixed seat for a long time will hinder the growth and development of the fetus. It may also cause blood clots to form in the veins. The working posture in front of the computer should not be fixed, and the working time should not be too long. If the office ventilation is poor, resulting in high indoor carbon dioxide concentration, excessive total number of bacteria in the air, low concentration of negative ions in the air, relatively high concentration of positive ions, low ozone concentration, and large indoor and outdoor temperature differences, it will make people susceptible to colds. . Therefore, the office must be ventilated regularly to keep the indoor air fresh. In summer, the indoor air temperature is preferably around 28°C, but not too low. In winter, it is 19~22°C, but not too high.