In what is to be thought to be a world first, a US man has shared the moment his wife gave birth to their son by live-streaming it on Facebook.

The intense 45-minute video viewed by more than 120,000 people was shot by the California woman's husband Fakamalo Kihe Eiki, who also helped with the delivery. In his Facebook profile he describes himself as a "Christian comedian".

He filmed the delivery in several stages, from early contractions to what seems to be the final pushes, noting that he was missing an important court date to see the birth in person.

Comments from friends were supportive, ranging from "Absolutely beautiful" to "You can do it, PUSSSSH" to "MAZEL TOV."

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Eiki responded with: "Thanks guys for enjoying the gift of life with me ... lol come celebrate next weekend bbq if in area," he wrote.