What is the shortest interval on record between the birth of two children?

The shortest interval on record between the birth of two children is just 23 days. This remarkable feat was achieved by a woman in the United Kingdom in 2012, who gave birth to her first child on September 12 and then to her second child on October 5 of the same year. Such a short interval is highly unusual and poses significant health risks for both the mother and the newborns.