The longest interval between the birth of triplets was 66 hr and 50 min for the birth of Christine, Catherine and Calvin, children of Louise and Robert Jamison of South Carolina, United States. Christine was born at 3.05 am on 2 January 1956, Catherine was born at 10 am on 3 January 1956 and Calvin was born at 9.55 pm on 4 January 1956.

The time is taken from the birth of the first child, to the birth of the third – not for the entire labour.