The baby boy, Vinayak, was born on Wednesday after his twin sister, Ishani was born much earlier on
October 3, 2005, according to Dr Siddhartha Chatterjee of the clinic. The achievement was possible after five years of experiments and research by the doctor.

A Kolkata-based couple Debayan Choudhuri and Rubai Choudhuri approached  Dr Chatterjee for help as they were childless even after five years of marriage. The doctor said “sperm and ovum were taken from the couple and three embryos were formed in the laboratory in January, 2005.” One of them was separated and placed in Rubai’s womb and she gave birth to a girl child, in October 2005, the doctor added.

The other two embryos were preserved in liquid nitrogen in deep freezer. Three years later, when the couple wanted another child, one of the preserved embryos was taken out of the freezer and inserted in the mother’s womb. The doctor said that the babies, even though the birth took place at an interval of three years, could be called as embryological twins as they were fertilised at the same time in the mother’s womb.