In which of the following rigor mortis is not seen?

Ans. d. Infant <7 months (Ref: Reddy 33/e p160. Parikh 6/e p3.15-3 17; Mody 22/e p231; http://en.wikipedia.org/wiki/ Rigor mortis)Rigor mortis may not be seen in infant <7 months due to smaller muscle muss.'Rigor mortis may not be perceivable in many infant and child corpses due to their smaller muscle mass. - http:// en.wikipedia. org/wiki/Rigor _mortisRigor MortisIn India, Rigor mortis commences in 2-3 hours, takes about 12 hours to develop from head to foot, persist for another 12 hours and takes about 12 hours to pass off.So if rigor mortis is not set in. the time since death would be within 2 hours and if it has affected the whole body, the time since death would be 12-24 hours.It does not start in all muscles simultaneously (Nysten's rule).Order of Appearance and DisappearanceHeart (Left chamber in 1 hour) - Eyelids (3-4 hours) - Face muscles - Neck and trunk - Upper extremities - Legs - Small muscles of fingers and toes (Last to be affected, 11-12 hours).It passes off in same order of appearance.It takes about 12 hours to develop from head to foot, persist for another 12 hours and takes about 12 hours to pass off.It usually lasts for 18-36 hours in summer and 24-48 hours in winter.Rigor mortis may not be perceivable in many infant and child corpses due to their smaller muscle mass