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I have added fertility via traits as follows:

Code:
fertile = {
	congenital = yes
	
	fertility = 0.4
} # Epigoni Mod - to balance out the infertile trait below
infertile = {
	
	fertility = -1.9
} # Epigoni Mod - used for castration

It shows up correctly in the game but I recently seen a women give birth with the infertile trait to three children. On this basis is doesnt seem to have much effect.

I did this a long time ago and if I remember correctly I had trouble adjusting it via events - I couldnt see any change in the history file.

You may also want to consider some of the entries in the defines.txt file:

Code:
	2 		# _CHDEF_BASE_NR_OF_CHILDREN_PER_COUPLE_ ( The number of children allowed per couple )
	60 		# _CHDEF_ADDITIONAL_CHILD_PROMINENCE_THRESHOLD_1_ ( An additional child will be allowed at this prominence )
	120		# _CHDEF_ADDITIONAL_CHILD_PROMINENCE_THRESHOLD_2_ ( Yet an additional child will be allowed at this prominence )
	2			# _CHDEF_ADDITIONAL_CHILDREN_FOR_KING_ ( Additional children allowed for kings and queens )
	1			# _CHDEF_ADDITIONAL_CHILDREN_FOR_HEIR_ ( Additional children allowed for the heir to the throne in monarchies ) 
	200		# _CHDEF_COURT_SIZE_CHILD_PENALTY_THRESHOLD_ ( When the total number of characters in a country is above this, one less child will be allowed per couple )