We are developing humans when the sperm burrows into the egg and the result starts to develop. It is absolutely impossible to develop into anything else. Depending upon the rate of development, according to the appropriate science, we are viable humans somewhere around 20 weeks and 500 grams of mass. That isn't semantics. That is what science discovers.Again, it's playing semantics. By the fetal stage we're "developing humans". Prove that term wrong. Anyone could argue it and I wouldn't apologize for having a differing opinion. Your answer would be no more right than mine. Words and phrases are subjective. We have the same genetic makeup as a one hour old embryo as we do when full grown, but there are obvious distinctive differences between a one-hour old embryo and a birthed bay or one that is 32 weeks along.
And there's a huge difference between your birthed boy and a 90 year old. So?