The passage of time between the births of the prophet’s children serves as a historical and spiritual timeline, charting the changing fates of the kingdoms of Israel and Judah. The natural progression from nursing one child to giving birth to another mirrors a tragic chain of sins, punishments, and exiles. On a basic physical level, the prophet's wife simply completes the period of nursing their daughter before conceiving and giving birth to another son [מצודת ציון, רש״י, ביאור שטיינזלץ]. However, this period of weaning also represents a significant historical delay between major national events.
Some explain that this waiting period symbolizes a long era of governmental weakness in the Kingdom of Israel. This vulnerability only ended when a new, powerful, and bloodthirsty king took control, an event represented by the birth of the new son [רד״ק]. Alternatively, the delay indicates that the destruction and exile of the Kingdom of Judah, represented by this third child, did not happen immediately but only after many days. The fact that the child is male specifically symbolizes the political strength the Kingdom of Judah enjoyed during the reigns of righteous leaders like Hezekiah and Josiah [מלבי״ם].
Beyond the passage of time, the primary approach among commentators is that the weaning and subsequent birth illustrate a deepening of sin and exile. This progression represents the generation that was banished to live among idol worshipers. Instead of repenting, they settled into their new surroundings, continued their wicked behavior, and raised a new generation in exile without ever returning to their homeland [רש״י, אבן עזרא, רד״ק]. Furthermore, the concept of weaning shares a deep conceptual connection with the idea of retribution. The reality that the Ten Tribes received no mercy and failed to return during the Second Temple era was not a random tragedy. Rather, it was a direct punishment for rejecting God and His Temple [אברבנאל].
The destiny of this third child is intimately bound to the ultimate fate of the Kingdom of Judah. His birth foreshadows the eventual destruction of the Second Temple, revealing that although the people of Judah experienced temporary salvation, they would eventually return to sin and face exile once more. A subtle shift in the narrative reinforces this distinction. When the first son was born, he was explicitly described as being born directly to the prophet. However, for the daughter and the third child, this personal connection is omitted. This absence signals that while the first son symbolized the impending disaster for the Kingdom of Israel—the prophet’s own home—the later children represent the downfall of the Kingdom of Judah, making them appear as though they belong to someone else [אברבנאל].