'''The length of pregnancy is 365 to 376 days''' but extreme variations ranging from 340 to 395 days have been reported (Kohli ''et al'', 1957; Tibary and Bakkoury, 1994; Macusoe ''et al'', 2004). Male foetuses are carried on average one day longer. | '''The length of pregnancy is 365 to 376 days''' but extreme variations ranging from 340 to 395 days have been reported (Kohli ''et al'', 1957; Tibary and Bakkoury, 1994; Macusoe ''et al'', 2004). Male foetuses are carried on average one day longer. |