Take the following as truth: Rather it may serve to delay the conception of a rival for maternal resources--both directly (by literally coming between Mom and Dad) and indirectly (by tending to prolong breast-feeding and, therefore, to suppress ovulation for a longer period).
Then the following statement: "It is useless to delay, directly or indirectly the conception of a rival for maternal resources." is true, false, or inconclusive?
Answer: False