The genetic material from the donor makes up less than 1% of the baby born by using the experimental IVF technique.

Eight UK babies were born healthy using a three-parent technique that combines DNA from three people to prevent rare genetic diseases.

Scientists at Newcastle University used a new IVF technique that combines a mother’s egg and father’s sperm with a second egg from a donor woman in order to prevent a child from inheriting mitochondrial DNA disease from their mother.