Doctors have not determined the sex of conjoined twins born four days ago to a Malaysian couple, a report said Tuesday.

"The doctors have yet to identify our babies' gender. They have also yet to determine if the babies are sharing any internal organs," Norhisyam Mohamad, 30, the twins' father, was quoted as saying by the New Straits Times newspaper.

The conjoined twins are joined at the abdomen and buttocks and each have a pair of legs.

The premature twins and their mother Sopiah Daud, 30, are in stable condition. The couple have three other children.