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Inhibition of human premature labor by indomethacin. Obstet , 1974 t must be admitted that the duration ofpregnancy not infrequenty exceeds 280 days rom the last menstrual period and that when it lasts much longer large children are developed which are frequenty delivered ony after great dficuly. Thus, whenever the menstrual history of the patient indicates that she has passed much beyond the tenth and is approaching the eleventh lunar month, we should consider the pro priey of the induction of labour, provided that examination shows the child is larger than usual.
-J. Whitridge Williams (1903) he above passage from Williams shows that pregnancies exceeding the expected normal length were problematic more than 100 years ago. These postterm pregnancies remain so today.