
The man -- in his 30s -- had given birth last year but the news was made public only recently, the Daily Mail reported.
The man's womb had not been removed during the original sex change operation.
Joanna Darrell, of the Beaumont Society transgender support group, said the man had asked about the health implications of keeping his womb.
"He got back in touch about six months ago to thank the society for its help and to say he had had the baby," Darrell was quoted as saying.
The baby was delivered by caesarean section.
Darrell said he was probably the first British man to have given birth.
"As far as we know there is only him, one man in America and one in Spain who have done this," she said.
A 38-year-old American, Thomas Beatie became the world's first pregnant man in 2007 and has given birth to three children -- Susan, Austin and Jensen.
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