Under what reasoning? Of course all advocates say that. This is the same old argument for 8 pages. Why does the mom get the rights and the child not? Why not reverse it and give the child rights and the mother not?
The real reasoning for abortion is that having a child would be inconvenient or painful for the mother. To justify it, we say that an unborn child has no rights.
I had a similar argument with Warbler in the politics thread. Rights are simply what we as a society define as morally correct and not. Somehow abortion advocates believe that these rights do not come till birth or 20 weeks gestation or whatever. I believe that these rights are inherent to all, regardless of their development.