A transgender man in Britain lost an appeal on Wednesday to be registered as his son’s father, rather than mother, on the child’s birth certificate. He now wants to take his case to the Supreme Court.

The man, Freddy McConnell, a freelance writer based in Kent, England, gave birth to a son in 2018, the year after obtaining a gender recognition certificate confirming him as male. But when he sought to register the birth, the register office told him that he had to be recorded as his son’s mother.

Mr. McConnell went to court seeking a reversal of that decision and asking to be registered as the child’s “father” or “parent.” He argued that his registration as “mother” of the child was a breach of both his and his son’s rights, and that this was a matter of domestic law.

But Sir Andrew McFarlane, the judge in the case, dismissed Mr. McConnell’s application for judicial review in September last year, and defined the status of being a mother as one no longer necessarily connected to a person’s gender.