What is characterized by massive physical growth between two to nine months?

The fetal stage is characterized by significant physical growth and development. During this stage, which occurs from approximately the ninth week of pregnancy until birth, the developing fetus experiences rapid enlargement, gaining weight, and developing vital organs and body systems. By the time a fetus reaches the two to nine-month mark, it undergoes dramatic changes in size and shape, preparing for life outside the womb.

During this stage, features such as limbs become more defined, the body becomes more proportional, and the fetus begins to exhibit recognizable human characteristics. Nerves and muscles develop, which allows for movements that can sometimes be felt by the pregnant individual, and the sense organs begin to mature. This growth is critical for the fetus to be healthy and viable at birth, making the fetal stage essential for successful development.

The other stages mentioned, such as the embryonic stage and the newborn stage, do not encompass this specific period of rapid growth. The embryonic stage occurs earlier in pregnancy and focuses on the initial development of major systems and structures. The newborn stage refers to the period following birth and involves adaptation to life outside the womb, rather than prenatal growth. The adolescent stage is focused on a much later period of life characterized by the transition from childhood to adulthood and does not pertain