An FBI agent said in court papers charging Ann Pettway with kidnapping that Pettway suffered several miscarriages before taking the baby from Harlem Hospital by train to her home in Bridgeport, Conn.
Pettway was awaiting a court appearance Monday.
She surrendered Sunday to the FBI and Bridgeport, Conn., police. The warrant was issued in North Carolina, where she's on probation because of a conviction for attempted embezzlement.
She turned herself in days after a widely publicized reunion between the child she raised, now an adult, and her biological mother.
The name of her attorney was not immediately known.