Longest interval between birth of quadruplets

Jackie Iverson (Canada) of Saskatoon, Canada gave birth normally to a boy Christopher, on 21 November 1993, a girl Alexandra, on 29 November 1993 and was delivered of another boy and girl, Matthew and Sarah, (by Caesarean) on 30 November 1993, nine days later. Seah Siew Hwee (Singapore), gave birth to her first quadruplet (a boy) on 14 September 2004 at 9.43 pm. The remaining three quadruplets (all girls) were delivered by Caesarean section on 23 September2004 between 11.34 and 11.36 pm, nine days 1 hr 53 mins later.