First frozen eggs and sperm babies

The world's first two babies conceived from both frozen eggs and frozen sperm have been born in Singapore.

The doctor who pioneered the technique, Cheng Li Chang, said it gave hope to couples who both had fertility problems.

No details about the identity or sex of the two babies have yet been given.

Worldwide there have only been around thirty babies born from frozen eggs that have been fertilised and then replaced inside a woman's body.

In this case the father had an extremely low sperm count, so his sperm was also frozen in an attempt to increase its useable lifespan in the infertility treatment.

From the newsroom of the BBC World Service