The definition of a fetus is literally an unborn baby
You're right about the semen part Now what does that have to do with this?
Can unborn offspring survive on their own? Have they developed into a baby? No they have not.
If I'm right about semen having potential yet procrastination is not infanticide, then carry over the logic. A fetus is not a baby, does it have potential to be born yes, but it is not a baby.