Fathers and brothers are increasingly defiling girls in families as women kill their newborns, police statistics show.
The 2015 annual crime report shows a 40 per cent increase in the number of incest cases.
There was a 55 per cent increase in the number of women committing infanticide.
Though the report, which derives the figures from complaints filed at police stations indicates that the number of rape cases have reduced, morality crime involving family members recorded a high.
In 2014, recorded incest cases were 240, which was also an increase from the previous year's 223.
The number rose to 336 in 2015, translating into a 40 per cent rise.
According to the report to be officially released by Inspector-General of Police Joseph Boinnet, other morality crimes that saw an increase were defilement, sodomy, bestiality, bigamy, abduction and indecent assault.
Defilement, which remains the leading form of morality crime, shot to 4,495 in 2015 from 3,685 in 2014.
The report indicates that the number of incest and defilement cases could be higher as some people prefer to settle the them out of court.
It also shows that sodomy is becoming rampant, with 124 cases being reported in 2015, translating to a 17 per cent increase.
Bestiality and indecent assault increased by 30 and 33 per cent respectively.
Reported offences of procuring abortion rose by 34 per cent, but there was a four per cent decline in the number of women who concealed birth.
Most cases of women concealing birth usually involve the disposal of newborns in pit latrines or dumping them in rubbish pits.
Nakuru County recorded the highest number of offences against morality with 419 cases. It was followed by Bungoma which had 373 cases.
Kilifi, Kiambu, Nairobi, Kakamega and Mombasa also recorded high numbers of morality offences.
Isiolo, Mandera, Wajir, Samburu and Marsabit had the lowest number of morality cases.
The reports shows that major urban centres recorded a decline in crime.
