Fertility doctors in Greece and Spain say they have produced a baby from three people in order to overcome a woman’s infertility. The baby boy was born weighing 2.9kg (6lbs) on Tuesday. The mother and child are said to be in good health. The doctors say they are “making medical history” which could help infertile couples around the world. But some experts in the UK say the procedure raises ethical questions and should not have taken place.