In evolution they say that everything came from one cell. And in every life, in every species it consists of many of these cells and in human beings it is like that and in others it is like that and it depends on how many of those cells there. What did Jibreel (as) bring from earth? He brought that cell.
Human lifespan and what affects it from the energy of the parents and the environment, to the interference of doctors.
Why babies die in the womb.
Is there incarnation?
Children may cleanse sins of the parents.