Creating so-called "designer babies" to help parents treat sick children is lawful and should not be banned, Britain's highest court ruled, rejecting an appeal against an earlier ruling. The country's five Law Lords unanimously backed a 2003 ruling that gave the green light to parents who want to extract genetic material from a baby brother or sister to treat a terminally ill sibling. Thursday's case centred on six-year-old Zain Hashmi, whose parents wanted a baby with a correct tissue match to help treat his life-threatening blood disorder. Zain's parents have begun treatment to create a baby, but have so far been unsuccessful.