BERLIN (AP) -- Switzerland's supreme court has ruled that a child born to a surrogate mother in the United States can't have two fathers.
The Federal Tribunal in Lausanne says only the 4-year-old boy's biological father can be legally registered on his birth certificate.
The men from eastern Switzerland, who are in a civil union, had gone to the United States in 2010 to find a surrogate mother who would carry an embryo, fertilized with one of the men's sperm and an anonymous donor's egg, to term.
A California court ruled in 2011 that the boy could have both men's names on his birth certificate.
But the Swiss court ruled Thursday that, since the couple had gone to the U.S. to circumvent Switzerland's surrogacy ban, the U.S. birth certificate wasn't valid.