UK sees first successful birth using DNA from three people.

The UK's fertility regulator has confirmed the birth of the country's first babies created using an experimental technique that combines DNA from three people. The technique aims to prevent children from inheriting rare genetic diseases caused by faulty mitochondria. The UK became the first country to adopt legislation regulating such methods in 2015. The genetic material from the donated egg comprises less than 1% of the child created from this technique. Critics argue that the experimental methods have not yet been proven safe and could lead to designer babies.