pregnancy_maintainance_effect

pregnancy_maintainance_effect = {
	hidden_effect = {
		historical_pregnancy_effect = yes # Handle specific scripted historical births

		remove_trait = pregnant

		#Save twin as child_2
		scope:child = {
			if = {
				limit = { has_trait = twin }
				random_sibling = {
					limit = { is_twin_of = scope:child }
					save_scope_as = child_2
				}
				
				#Identical twins
				if = {
					limit = { sex_same_as = scope:child_2 }
					random = {
						chance = 50
						copy_inheritable_appearance_from = scope:child_2
					}
				}
			}
		}

		#BASTARD OR NOT? TO HANDLE NON-COMPLICATED BIRTH EVENTS
		#It is a bastard!
		if = {
			limit = {
				has_variable = {
					name = unmarried_bastard_pregnancy
					name = bastard_pregnancy
				}
			}

			#To see if the assumed father has died while pregnant with unknown bastard
			if = {
				limit = {
					scope:mother = {
						NOT = { has_character_flag = pregnancy_real_father_of_bastard_is_known_flag }
						exists = var:dead_spouse
					}
				}
				var:dead_spouse = {
					save_scope_as = father
				}
				scope:child = {
					set_father = scope:father
				}
				scope:mother = {
					remove_variable = dead_spouse
				}
			}

			#To fire the right event for the mother if the child secretly is a bastard
			if = {
				limit = {
					NOT = { has_character_flag = pregnancy_real_father_of_bastard_is_known_flag }
					has_character_flag = bastard_pregnancy
					secret_disputed_heritage_is_valid_trigger = {
						TARGET = scope:child
					}
				}
				add_secret = { #Set up a new secret about the child
					type = secret_disputed_heritage
					target = scope:child
				}
				random_secret = { #Find the secret
					type = secret_disputed_heritage
					limit = {
						secret_target = scope:child
					}
					save_scope_as = new_secret
				}

				#If the real_father knows they're the father they will get an event about the bastard being born
				if = {
					limit = {
						has_character_flag = pregnancy_real_father_knows
					}
					scope:child.real_father = {
						add_to_list = illegitimacy_secret_knowers
					}
				}
				#If the spouse knows they're NOT the father they will get an event about the bastard being born
				if = {
					limit = {
						has_character_flag = pregnancy_spouse_knows_of_bastardy
					}
					scope:child.father = {
						add_to_list = illegitimacy_secret_knowers
					}
				}
				every_in_list = {
					list = illegitimacy_secret_knowers
					#A secret bastard is born - Share the news with everyone who knew that it was a bastard
					trigger_event = secret_bastard.0001
				}
			}
			
			#Check for unmarried mother bastardy flag
			else_if = {
				limit = {
					NOT = { has_character_flag = pregnancy_real_father_of_bastard_is_known_flag }
					has_character_flag = unmarried_bastard_pregnancy

					# Must be able to have the illegitimate child secret.
					secret_unmarried_illegitimate_child_is_valid_trigger = {
						TARGET = scope:child
					}
				}
				add_secret = { #Set up a new secret about the child
					type = secret_unmarried_illegitimate_child
					target = scope:child
				}
				random_secret = { #Find the secret
					type = secret_unmarried_illegitimate_child
					limit = {
						secret_target = scope:child

As written in game/common/scripted_effects/00_pregnancy_effects.txt.