The Ultimate Slippery Slope

This is extremely troubling:

The Dutch doctor spoke animatedly in his hospital office as he explained why he had agreed to break the law and kill a seriously deformed baby.
"There is a small group of children for whom no treatment is possible for the congenital disease and malformations they are born with," said Eduard Verhagen, the head of paediatrics at Groningen Hospital in the Netherlands. "Asking doctors to take away the pain easily and allow the child to die quietly is the natural reaction.
"For the incurable to die early requires that we do this or they enter a starvation phase and what suffering is more unbearable than a minor left to die from natural causes such as these."
Dr Verhagen's actions have already provoked condemnation from the Vatican and others who argue that the right-to-life must remain inviolable.
Other Dutch doctors side with Dr Verhagen, however, and in the past four years have sought to challenge this by reporting 18 such cases of "neo-natal" deaths to the national prosecutor's office in the Hague.

This is one of those ethical questions that a civilized society must ponder. What criteria will be used to determine what children are killed? Now it's incurable congenital disease or defect, but what about fifteen years from now? Will it be the sex of the child or other such criteria. Will liberals say that it is alright to kill a child because that child was produced by rape?