Why are couples not having children despite beds and food?

Check an adult couple's family, the mother's race-specific fertile age, birth interval and birth allowance. Base allowances are 4 for ordinary families and 8 for nobles and lords; this calculation adds 1 for the benevolence belief and subtracts 1 for education. An active ordinary population policy directly returns its allowance instead. Bed-dwelling races need a fertile double bed: ordinary and fine double beds qualify; small, fine small and bunk beds do not substitute. Noble births also require happiness of at least 80. Prioritising fertile couples changes bed allocation, not pregnancy eligibility.