Why this name?

fetus, 

the unborn young of any vertebrate animal, particularly of a mammal, after it has attained the basic form and structure typical of its kind.

The fetus is not merely a stage but a foundational period that impacts every future stage of life, from infancy to old age. Through its biological, social, and ethical significance, it plays a pivotal role in the life cycle, affecting the individual, family, and society at large.

The fetal stage is a bridge between conception and infancy. Healthy fetal development increases the likelihood of a safe birth and a healthy childhood, affecting life stages well beyond infancy. he fetal stage is essential in the life cycle as it ensures the propagation and survival of the human species. Successful fetal development is a product of evolution, designed to maximize the chances of survival and reproduction.