I’ve known more than my share of people with clinical depression, driven to commit suicide, to not allow me the luxury to partake in the fantasy you project. Every soul has a calling and purpose? What purpose does a spontaneously (naturally) aborted (miscarried) foetus have, often ejected without the mother even being aware?
As I stated, nobody could ever know because we are non-transcendent. You are talking about natural evil, things such as tsunamis and tornadoes that kill people, without other people being involved.
Unfortunately, there is a widespread delusion that God’s purpose in creating this world was to craft us a nice little terrarium where nothing bad ever happens. Unfortunately it may be the case that for God’s will to be carried out, we must live in a world saturated by evil.
In a world without God however, the baby you describe really has no objective moral value anyway. It has no soul, it is simply organic matter, no more valuable than a piglet or a caterpillar, as Richard Dawkins has described unborn babies. It really is a little self-refuting to deny God and then seem to mourn the suffering and death of other living creatures. Would you weep for a dead frog? If not, then why weep for a dead child? In a world in which only the natural exists, neither is more valuable than the other. You’re simply projecting your own delusion of moral value that doesn’t exist. Both are simply the product of biological reproduction, in the same cycle of life and death. It is all meaningless.
Who is a human to question the Creator? You don’t know enough to ask the right questions, or understand if given an answer.
Do you know what happens to the infant (fetus) after the miscarriage? If not, how can you judge?
Just because yu don't know, doesn't mean there's not a reason.
But perhaps setting the stage for the next baby to come along, who might not have had the pregnancy continued.
I believe I miscarried once but was not sure. A couple months later got pregnant with my youngest daughter. Had the other suspected pregnancy occurred, Yes, I would have had a different child, but obviously, to me, God has a plan for THIS one, the one I have now, who would not exist under different circumstances.