Why do babies die in the mother's womb?

Yes it is natural.

Many women may develop problems only the doctors know what is truly wrong with her and what not after the whole situation.

No not really. The baby probly had an unhealthy birth that led to his death. Or the baby had some kind of disorder that the doctors where not aware of. And that is super sad :(

nope.avi prenatal mortality is a common problem in today’s society, especially in the more civilized regions of the world it is on the rise, causes unknown

it is a natural occurrence in nature, sometimes the fetus is not fully evolved in the late stages, and the female body reacts by having a “spontaneous” abo­rtion, other times it is just that, spontaneous, without any prior signs of problems without any warning it can happen…. usually this means the woman has some sort of pathological problem, it can happen from hormonal imbalances, massive infections, the placenta may have ruptured and allowed bacteria to enter etc etc.

About half of the cases of stillbirth occur due to unknown causes. Other causes are infection, poor fetal growth, placental issues, chronic health problems with mom, and birth defects. More in depth information here: http://funadvice.com/r/15tm7kfvai1, http://funadvice.com/r/15tm7kfvc08 (scroll down).