At 100 days of pregnancy, which is clinically equivalent to 14 weeks of gestation, the fetus is almost formed during this period, with a length of about 9-10 centimeters and a weight of about 30-40 grams. Through imaging, the development of the cranium, limbs, intestines, spine, external genitalia, etc. is generally visible in a 100-day pregnant fetus, and the nails of its toes and fingers have begun to grow. The basic structure of the fetus on the 100th day of pregnancy has been formed, the growth of body parts accelerates, the proportion of the limbs is gradually harmonized with the proportion of the rest of the body, and the dexterity of the hands and feet increases. At this stage, fetal hair begins to grow on the fetus’ body, liver and gallbladder functions gradually develop, facial muscles gradually begin to move, and sometimes movements such as frowning and squinting are visible from imaging. The development of the fetus at 100 days of pregnancy is basically stable, but with the growth of the pregnancy cycle, pregnant women need to carry out regular obstetric examination to observe the growth of the fetus, and if abnormal growth problems are found, they should go to the hospital in time for review, to make a clear diagnosis, and carry out targeted treatment as early as possible.