'Modern twist' on fertility technique may offer hope for sterile men

Fourteen healthy children have been fathered by previously infertile men in Japanese trial using round spermatid injection

Fourteen babies have been born following the injection of very immature sperm cells into eggs - a technique that could help infertile men to become fathers, scientists say.

The 14 children were born to 12 men and their partners in Japan after round spermatid injection (Rosi), which has been banned in the UK since the 1990s due to concerns for the health of any children it might create.