Mazzarella did make some useful points . Like some of us considering the baby as just a part of mothers body , which can be wrong sometimes. As mazarella said, baby has its own heartbeat by 5th week , and that embryo circulates its own blood , which may by different blood group than the mothers.
By 16th week, the fetus can control its movement , so I consider the baby as a new life by now. Which some of you may not consider.
Personally, I would not support abortion after this time period.
So watever raju161 posted above, I agree with his points. His posting mentions the fetusof 23 weeks . By this time , the fetus has developed and functioning nervous system and if the baby borns after three weeks later, it can survive.
And as GrgDai said, if gangraped or misconception ( 95% chance as grgdai said) , the mother should be allowed to decide. However, it would be better if the abortion is perfomed early rather than waiting till the baby grows fully. For the rape victim, you can just take oral pills to end pregnancy under health care supervision by first few weeks, and you dont have to go for chopping/sucking the embryo .
What I am trying to point out here is that aborting a baby considering him/her as mother's body just a couple of days before the actual delivery date is simply cruel. It should be destroyed before it is fully developed.