If life begins at conception, and 1/3 of all pregnancies end in miscarriages...?

Only God knows.

Do you have the right to say when a life begins, ends, or starts? I don't know. I don't know if life begins at conception, at birth, or somewhere in between. I also don't know all the reasons behind miscarriages, no one does. Almost all of them are because of something that went fatally wrong to the point where the baby would not have lived. Many many of them happen before most people would normally know they were pregnant. There could also be biological reasons. For instance, after my pregnancy my monthly cycle was a bit out of whack. After my miscarriage everything went back to normal, and the pregnancy I'm in now seems to be going by the book again. For me at least it seems that while my body 'said' I was pregnant, it was doing something more complex resetting things.

What I do know is that a miscarriage is a natural occurrence. An abortion is not. A miscarriage has actual health reasons behind it, they almost never happen with a healthy baby or with a healthy pregnancy or without something having happened to trigger it. An abortion is, with the exception of rape, incest, or mom will die if she goes through the pregnancy, driven by selfishness. They're very different.

Why do babies die?

Ps. 51:5, JB: “You know I was born guilty, a sinner from the moment of conception.” (See also Job 14:4; Genesis 8:21.)

Rom. 3:23; 6:23: “All have sinned and fall short of the glory of God . . . The wages sin pays is death.”

God does not “take” children from their parents, as some have been told. Although the earth produces ample food, selfish political and commercial elements often hinder its distribution to those most in need, resulting in death due to malnutrition. Some children die in accidents, as adults do. But all of us have inherited sin; we are all imperfect. We were born in a system in which everyone—both the good and the bad—eventually dies. (Eccl. 9:5) But Jehovah ‘yearns’ to reunite children with their parents by means of the resurrection, and lovingly has made provision to do so.—John 5:28, 29; Job 14:14, 15; compare Jeremiah 31:15, 16; Mark 5:40-42.

They are in heaven. Interesting thought about their having never experienced life on earth. I never thought of that before. There would be so much that they did not know or experience. Maybe they get another chance?? Some people I know think that. But I don't know.

Obviously, the big fairy in the sky is responsible for every miscarriage, and so is guilty of murder. Why don't christians care that their fairy is a killer? Hypocrisy is the only explanation.

Those who believe in purgatory, believe they end up there.

I would assume others believe they go to heaven, as they are innocent.