If that were true under Current Law, PBA would be illegal (doctors describe PBA as Infanticide, PBA=Partial Birth Abortion).
There are two rulings by the US Supreme Court -- Roe v. Wade (Norma McCorvey vs the DA of Dallas) and Doe v. Bolton (Sandra Canoe vs the DA of Fulton County).
The Doe v. Bolton decision makes abortion legal during any time of the pregnancy!
The Roe v. Wade ruling made abortion legal, but did not say the term of the abortion (it supposedly was only 1st Term abortions).
Currently, the Partial Birth Abortion Ban signed by President Bush and the Congress is in jeopardy of being overruled by the US Supreme Court (if Roberts is not on that court come October).
Roberts being on the court in October is important -- Sandra Day O'Connor can come out of retirement to take the bench in October with two cases I care about coming up.
You make an interesting point. Does Doe v. Bolton make abortion for ANY reason legal during any time of the pregnancy?
I suppose what may happen is that rather than changing minds on abortion, instantaneous viability of the fetus at conception, which is the theoretical limit that technology is approaching, will force the redefining of what it means to be born. Only then, apparently, will abortion be murder in the legal sense.