Updated

A South African court has approved an investigation into a case of two baby girls who were mistakenly swapped at birth and given to different mothers in a hospital in 2010.

The Centre for Child Law, a South African group that promotes children's rights, said Thursday that a court has appointed it to find out about the switch at Boksburg hospital, near Johannesburg, and to decide what would be in the children's best interests.

Court documents say one of the mothers recently learned about the mistake and wants her biological daughter to be placed in her care, and to return the other girl to her biological mother. But the second mother has refused.