A white couple from New York has filed a malpractice lawsuit against a doctor they allege was responsible for an embryo mix up during in vitro fertilisation that resulted in the woman giving birth to a black baby when she delivered twins.

The couple, who gave birth to their own white baby at the same time, allege that their doctor, Lillian Nash of New York, was wilfully negligent when she mistakenly implanted the embryo of a black couple from Teaneck, …