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The 'round spermatid injection' is an amazing Japanese technique that has made 12 sterile men father children, according to The Daily Mail.

The Japanese technique is a procedure in which the doctor injects "a very young sperm into a woman's egg" and helps men with sperm production problems that cannot make an egg grow.

This injection was started to be used in the 1990s, but worries of genetic abnormalities began to grab people, due to the "immature sperm", so it got banned. Today, doctors have refined the technique and enabled the creation of 14 babies from just 12 fathers!

"Round spermatid injection was effectively used in our clinic and resulted in the birth of 14 healthy babies," said the team of researchers from the Institute for Assisted Reproductive Technology (ART) in Fukuoka, Japan.

All the babies are robust and healthy, with complete mental and physical fitness, according to The Belfast Telegraph.

"Although the current success rate of round spermatid injection is not very high compared with intra-cytoplasmic sperm injection (ICSI), this procedure can be the last resort for men who cannot produce spermatozoa but wish to use their own genetic material to produce offspring," the team said.