How many months into pregnancy does the fetus take shape?

Generally speaking, pregnancy refers to gestation, and the fetus typically takes shape between 3 to 4 months of gestation. A detailed analysis is as follows:

Fetal formation is a gradual developmental process that begins with the fertilized egg and proceeds through various stages until the end of gestation. In the early stage of pregnancy, around the third week after fertilization, the fertilized egg implants into the uterine lining and becomes an embryo. By approximately the fourth week, the embryo begins forming embryonic structures, including the embryonic disc, embryonic vesicle, and embryonic tail. The embryonic disc develops into the placenta, which functions in oxygen supply, nourishment, and waste elimination. During the middle stage of pregnancy—between the 9th and 12th weeks—the embryo undergoes further development and shaping. At this time, organ systems begin to form. The embryo's head and facial features start to emerge, and the structures of the eyes, ears, and nose begin to develop. The heart starts beating and establishes an initial circulatory system. The limbs begin to form, and fingers and toes start to differentiate.

By the later stage of pregnancy, from the 13th to the 16th week, the embryo has developed into a fetus; therefore, the fetus is considered formed by 3 to 4 months of gestation. At this point, the muscles, bones, and nervous system continue to develop further. Internal organs also begin maturing, including the lungs, liver, kidneys, and digestive system. External features become increasingly distinct, allowing facial characteristics, hands, feet, fingers, and toes to be clearly observed.

Normal fetal development requires adequate nutrition and a healthy prenatal environment. Therefore, pregnant women should pay attention to adjustments in diet and lifestyle to ensure the healthy growth of the fetus.