About 25 years ago, my wife experienced the premature birth of our son, which you might (quite incorrectly) call a spontaneous abortion.
We had arrived at the hospital very early in the morning, long before our doctor, and the baby arrived only moments later, just as three of the best neonatal pediatricians in the state happened to be strolling by.
As a result, my wife and our very premature son (who couldn't breathe, and was born folded roughly in half) received a level of care, guided by a team of experts, that would never have been possible if our regular doctor had been there.
In light of his condition, we baptized our son immediately.
Later that day, as I was washing up to go in and see him, I ran into another new father, whose son had also been born prematurely.
Unfortunately, his wife had died, during labor.
Some 7 weeks later, my wife and I were able to take my son home. And from that day, he's always been a fine, healthy fellow.
There is no way to explain why all these things happened as they did, or why our outcome was completely successful, but that other man's wife had to die.
I believe that God honors our freedom by keeping out of our business unless we, or someone else who loves us, asks him to step in.
Depending on how far things have progressed up to that point, God may choose to fix the problem, allow it to proceed unabated, or call a halt to it entirely, and bring a soul home.
To presume to know why, or to attempt to fathom the mind of God is folly.
The one thing I am sure of though, especially after spending almost 2 months sitting beside my son in the neonatal intensive care ward, is that God does not "abort" babies ... any of them ... because any kind of abortion is an abomination, in his eyes.