Why do people call a fetus a baby when a fetus is not a baby?

Update: A toddler is closer in age to a 60 year old in terms of development than a zygote is to an infant but yet there are people out there who consider zygotes as living breathing infants even they are not even developed, so can you give a reason and/or scientific evidence that a zygote is actually an infant without... show more A toddler is closer in age to a 60 year old in terms of development than a zygote is to an infant but yet there are people out there who consider zygotes as living breathing infants even they are not even developed, so can you give a reason and/or scientific evidence that a zygote is actually an infant without appealing to emotion or religion?
13 answers 13