My point is that unwanted children can live just as important and fulfilling lives as wanted and loved children, thus advocating killing them because they are unloved or unwanted is pointless.[/quote}
This is far different than saying "every child born should have the chance to live a fufilling life." One statment says that people should live because they could live a fufilling life, while the other says that because they could have a fulfilling life they are worthy of being alive. You are using the potential of having a fulfilling life as a yardstick for being worthy to live. If having a fulfilling life is the standard used to justify life, it's also a means to justify death. The point is, if people are worthy of life inherently, then if they have a fulfilling life ahead of them or not is not a concern. If we only allow life to people who have fulfilling lives, then you are advocating the same point the original poster was making, only in reverse.
If you think that "everybody should have a chance at life" then if their life is fulfilling or not should not matter to you. So again, your point that people should live because their life could be fulfilling does not imply that "everybody should have a chance at life," it implies that everybody who has the potential to lead a fulfilling life should have a chance at life. It implies that you do not believe that people have an inherent right to life, and that what you're saying and what the other poster are saying is the same thing.