have to be sacrificed that the other may live, Dusit Stworn, spokesman for the medical team carrying out the operation, told Reuters on Thursday. „For the time being our medical team will try its best to save both infants. However, if we need to, we may have to do our best to save one infant. Their parents have been informed of this plan,“ he said. He did not say how the parents felt about that possibility. Chananthida and Jiyayu Khaensa were born nine days ago in northern Lopburi province and transferred two days ago to Bangkok‘s King Mongkut Hospital, where they are in intensive care. Dusit said the top halves of their hearts were joined. „The ventricles are connected and it is extremely difficult to separate them,“ he added. But the twins need to be separated to provide the best chance that at least one will survive. Doctors said Jiyayu‘s heart was not as healthy and her general condition weak, giving her a poor chance of surviving the operation. Dusit declined to say when the operation would take place. None of the doctors on the team has attempted such an operation before. „We are in the process of organising the plan to operate and we are really having a difficult time,“ he added. The name „Siamese twins“ derives from joined male twins born in Siam, now Thailand, in 1811.