The tragic end of the relationship between King David and Michal, the daughter of Saul, is sealed with distance and an inability to have children. Following a harsh confrontation between them, Michal is left without any continuation of her family line. The primary approach among commentators is that this childlessness serves as a punishment for mocking and disrespecting David. Instead of honoring his complete devotion and wholehearted service to God while bringing up the Ark of the Covenant, she chose to belittle him.
Opinions differ on how this punishment actually played out. On a natural and personal level, the intense argument created a deep rift between the couple. David, who had other wives, simply distanced himself from Michal completely [ביאור שטיינזלץ]. Conversely, other commentators reveal a deeper historical and providential layer. Her inability to have children was not just a specific punishment, but a deliberate act by God to prevent the mixing of Saul's lineage with David's. God foresaw a future where the Gibeonites would demand the execution of Saul's descendants. If David had sons with Michal, he would have faced a cruel and impossible dilemma: either execute his own children, or spare them and be accused of favoritism and bias. To prevent this severe complication, God ensured that Michal would not conceive from David [מלבי״ם, אברבנאל].
Regarding the timing of her childlessness, the condition applied specifically from that day forward. This leaves room for an early tradition suggesting that she did in fact have children before this event, identifying her with another of David's wives named Eglah [רש״י, רד״ק].
Furthermore, the duration of her condition presents a fascinating contrast in interpretation. The simple understanding is that Michal remained childless for the rest of her life [אברבנאל]. However, a different tradition offers a completely opposite reading: she had no children until the very day she passed away, meaning she actually gave birth on the day of her death. According to this view, Michal died during labor. This makes her one of three women in the Bible who passed away while giving birth, alongside Jacob's wife Rachel and the daughter-in-law of Eli the High Priest [רד״ק, צאינה וראינה].