A British boy with a rare blood disorder has been successfully given stem cells from his perfect match “designer baby” brother. Five-year-old Charlie Whitaker’s only hope for surviving Diamond Blackfan Anaemia was a stem cell transplant. His parents, from Derbyshire, went to the US for test tube baby treatment to select a donor sibling for Charlie because it is not allowed in the UK. The UK’s fertility watchdog has since relaxed its rules on the procedure. The Human Fertilisation and Embryology Authority announced last week that embryos could be selected which are free of disease to provide blood cell transplants to treat sick brothers and sisters.