The man, who is believed to be in his 30s, was able to carry a child after taking female hormones to reverse the effects of his female-to-male sex change treatment.
The Daily Telegraph understands that the man, whose identity has not been diclosed, is from the West Midlands and is in a long-term relationship. It is not clear whether his partner is male or female.
Last night medical ethics experts called for a full inquiry into the issues surrounding transgender births, saying the interests of the child should not be risked to "fulfil the rights of an adult".
Although he has legally changed his gender to male, the man in question was able to give birth last year because his womb was not removed during the original sex change procedure.
It is possible for transgender men who were born women, who still have functioning ovaries and a uterus, to become pregnant while still identifying and living as men.