Is a woman whose husband died and who gave birth to her child one day after his death required to observe the iddah (waiting period) of death, even though she did not intend to observe the iddah before giving birth?

The waiting period (iddah) is a right of Allah Almighty, incumbent upon a woman upon divorce or the death of her husband. Its rulings apply to the woman observing iddah as soon as the reason for it occurs, without needing an intention. To understand the completion of the waiting period for a pregnant woman upon giving birth, please refer to answer number: 32455.