What I'm suggesting is a balance between natural rights and consequentialism. The current situation where we only care about natural rights is also horrific, so

What I'm suggesting is a balance between natural rights and consequentialism. The current situation where we only care about natural rights is also horrific, so there is no ground for a slippery slope argument. Adults and even children can make choices about their treatment or if they prefer to die (do you think the children in this article should have been given this choice incidentally?) But for babies we should be willing to make that choice for them in extreme circumstances.