The top breech diameter of the fetus at 11 weeks of pregnancy is about 4.5cm. The development of each fetus during pregnancy varies and there is no absolute reference standard. At 11 weeks of pregnancy, the ultrasound test will show that the diameter of the top and bottom of the fetus is about 4.5cm, the net weight is about 14 grams, and at this time, the fingernails and hair of the fetus are somewhat visible. In addition, the fetus will also move its limbs in the womb. Sometimes it stretches its arms and kicks its feet in the womb. This is the early stage of pregnancy, you can go to the hospital to do NT examination and record, verify the pregnancy week and carry out pregnancy care under the guidance of the doctor. During pregnancy, pay attention to rest, do not be tired and stay up late, avoid contact with toxic and harmful substances.