Parliament in Belgium has passed a bill allowing euthanasia for terminally ill children without any age limit, by 86 votes to 44, with 12 abstentions, BBC reports.
When, as expected, the bill is signed by the king, Belgium will become the first country in the world to remove any age limit on the practice.
It may be requested by terminally ill children who are in great pain and also have parental consent.
Opponents argue children cannot make such a difficult decision.
It is 12 years since Belgium legalised euthanasia for adults.
In the Netherlands, Belgium's northern neighbour, euthanasia is legal for children over the age of 12, if there is parental consent.
Under the Dutch conditions, a patient's request for euthanasia can be fulfilled by a doctor if the request is "voluntary and well-considered" and the patient is suffering unbearably, with no prospect of improvement.