The 16th week of pregnancy is stabilizing compared to the early stages of pregnancy, but for the whole pregnancy it is necessary to pay close attention. At this time the fetus has completed the development of its head, arms and legs, is 16 cm long, has a length from head to rump of about 12 cm and weighs about 110 grams. The average value of the biparietal diameter is 3.62 cm, the average value of the abdominal circumference is 10.32 cm and the femur length is 2.10 cm. The external genitalia are ready to confirm the sex, the abdomen is already more clearly dilated and the fundus is between the navel and the pubic symphysis. The joints of the fetus begin to move, chorionic hair grows on the head, the stomach secretes digestive juices and the kidneys secrete urine. The circulatory system and the urinary tract enter normal operation, and the fetal lungs begin to work and are able to inhale and exhale amniotic fluid continuously. Normally, if you have regular periods, you can schedule time for a maternity checkup in the hospital below. The main test is Down’s syndrome screening, which is a screening for fetal trisomy 21, trisomy 18 and neural tube abnormalities. This is a screening for congenital genetic disorders of the fetus and is of great significance. Pregnant women should try not to miss it and should not go beyond 20 weeks. Most pregnant women in this cycle, the most sad early pregnancy reaction of not being able to eat is over and the fetus is more stable in its development. If you feel that the fetus has entered a stable phase, you can go out properly or have a moderate sex life. However, you should not be careless, as many problems may occur if you are tired or sick or if you do not eat properly.