Doctors used a pioneering IVF procedure aimed at preventing  infants developing incurable inherited diseases.

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In mitochondrial donation, 99.8 per cent of the baby’s DNA is from the mother and father.

But a small amount of tissue is added from the eggs of a healthy female donor.

No details on the parents or baby have been given, but research has been carried out at the Newcastle Fertility Centre since ministers gave the green light in 2015.

Critics claim it opens the door to “designer babies”.

But supporters insist it will allow thousands of UK women carrying deadly diseases to give birth safely.

The UK’s Human Fertilisation and Embryology Authority has approved at least 30 more cases