WriterofDreams, have you heard of Ferdinand de Saussure? He was a Swiss Linguist, who talked about language being the relationship between 'signifiers' and 'signifieds'.
When you say a word, you have a mental image of what that word means. More complicated than it's literal meaning, but connotations.
So, someone may say they were 'hurt' and we get the image of pain, injury. if they say they were 'attacked' we get the image of not only pain, injury, but also of a perpetrator, a person who did wrong.
Although we use words in fairly indiscriminate ways sometimes, at other times, the words we use indicate how we feel about something, and in trying to be objective, we can 'leak' our true feelings.
I think, personally, that using the word 'foetus', while technically scientifically correct, is pushing away the notion that this is a baby. By doing that, it is easier to accept that one could terminate.
Then, using 'child' makes the baby more concrete, more real.
It's why some people use terms such as 'bundle of cells', because it is easier to think of that at 16 weeks, than a formed baby with skin, eyelashes, fingernails and hair, despite the need for further development to be able to survive outside the womb.