Hayden Cross, 21, was born a girl and was legally male when he used transgender hormone treatment to conceive, using a sperm donor he had met on Facebook.
Cross made headlines around the world and provoked an ethical debate when he announced his pregnancy in January - thought to have been the first case of its kind in the UK.
His family confirmed he gave birth to a girl, Trinity-Leigh Louise Cross, on June 16, and said both were healthy and doing well. It means Cross has become the first known transgender man to give birth in Britain.
Trinity-Leigh's birth certificate has Hayden Cross listed as the mother but there is no father registered.
The sperm donor’s identity has never been revealed, with the sperm handed over in a pot on the doorstep of Cross’s flat in Gloucester.
In January, Cross told how he was living as a man but was desperate to have a baby, which he wouldn’t be able to do once his sex change was complete.
He had started hormone treatment to complete his transition three years ago, but stopped it in September last year so that he could become pregnant.
The world’s first pregnant man was American Thomas Beatie in 2007, who was also born female. He went on to have three children using donor sperm.