The value is zero until its a baby.
I not only don't have to agree with you, I don't even need to consider your rigamarole of comparison. I am at liberty to make my own decision in the matter, and I say it's a baby once its born. None of your science arguments gain any traction here, as my personal decision on the point at which to start valuing that Human is mine alone, and I do not have to base it off of your parallels or your opinions.
Heres the big point that I have not even gotten out yet.
Consider this jallman:
Society is having its town hall meeting. You decry abortion. I stand up and ask if the Town Hall will fall down if we ignore abortions. Since it won't, why don't we just ignore tham, rather than try to get violence on a large portion of our already existant citizens ? I simply reject your interference in the reproductive cycle of other citizens as rude and unwarranted. Attack already existant citizens over a potential citizen ? Are you Nuts ?