Allah knows what any female bears, and what decrease or increase takes place in the womb. Everything has a due measure with Him. (Allah's Guidance is a Mercy to humanity. You may liken it to the nourishment of the embryo in the evolving environment of the womb. The embryo lodges in security and its needs are met in a timely fashion and in perfect balance. Then it comes to the world ready to thrive. This is how the Divine System, when established in a society, nourishes the individual).