Since the formulation of the Fertility and Embryology Authority in 1991, 18,000 babies have been born by embryo, egg and sperm donation. At the moment, 16-year-olds can check whether they are related to someone they want to marry and at 18 they can ask if they were conceived by egg or sperm donation. Donors can choose to make minor details available such as occupation, height, race and eye colour.