A transgender man has given born to a baby boy in the US. 

Trystan Reese, from Portland, Oregon, was born female but started taking hormones almost a decade ago, The Independent (UK) reported. 

He stopped when he got pregnant and has now given birth to a son, Leo. 

Leo becomes the first biological child for Reese and his husband, Biff Chaplow, who already have two adopted children.

"I would say it's unique. I understand that people are not used to two men having a biological child," Reese said. 

“The moment he was born was just like a pure moment of bliss, like the happiest moment of my life. To see the very beginning of Leo, of his life, was just like amazing,” Chaplow added. 

The couple said their friends and family have supported their decision throughout but they have received some backlash from people online. 

The news comes only months after the first transgender man to give birth in the UK.

Hayden Cross, 21, made headlines around the world when he announced he was pregnant by a sperm donor, three years after becoming legally male through gender reassignment.

His daughter Trinity-Leigh was born by caesarean and he described her as “perfect in every way”.