Why isn't a baby called a baby but a fetus?

why is an adult called an adult not a human being?

Probably for the same reason a child is called a baby, toddler, preschooler and school age. It just describes the different stages of development.

why is a house sometimes called a home?

it all has to do with the person, and what emotion they are trying to get across.

a baby… a cute cuddly little life that cries and poops a lot.

a fetus… lets talk medical or science terminology.

A baby is called a fetus because it’s basically a parasite which is growing in the womb, then born through the vagina, or belly (c-section). Instead of calling a growing fetus a parasite, they decided for the sake of the female’s emotions and hormones, call the parasite a fetus after development (14 weeks). You can also google it.

From Answers.com

fe·tus (fē‘təs) n., pl. -tus·es.

The unborn young of a viviparous vertebrate having a basic structural resemblance to the adult animal.

In humans, the unborn young from the end of the eighth week after conception to the moment of birth, as distinguished from the earlier embryo.

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All the scientific stuff. I know why I just really dont wanna explain the whole entire just of it.

Difference in stage of development, that’s all - most definitely a human being !!