http://revach.net/article.php?id=5322

Section: Parshas HaShavua   Category: Quick Vort
Parshas Naso: Kli Yakar - The Explosion of the Sotah's Stomach

If the Sotah is guilty of the crime she was accused of by her husband, then after drinking the Mei Sotah her stomach explodes. Why is this so?

The Kli Yakar answers that the Mei Sotah was very holy water. The water itself comes from the Kiyor in the Bais HaMikdash that is used by the Kohanim to purify themselves before Avodah, while the main additive is the Name of Hashem that is erased into the water. As this water is so holy, says the Kli Yakar, surely it is not fit to travel through the organs of intimacy in the usual manner that water is passed out of the human body. Since it is trapped inside the Sotah's body, her stomach blows up and then explodes.

However if the Sotah is innocent, and has been completely faithful in her relationships, then she reverts back to the Kedusha of Adam HaRishon before he sinned. At that juncture all the organs and limbs were holy and there was no shame, which is why they did not have clothing. That being the case, the holy Mei Sotah flowed right through her system and out.

Maybe this also explains why the innocent Sotah is blessed with children if she is still childless, or healthier and stronger children if she already has children. Since the Mei Sotah is pure Kedusha, it cures any of the woman's internal physical imperfections that it passes along its route out the body, and paves the way for beautiful, healthy, and holy children.