Here are my points on the matter.

If everybody that was ever born was able to live untill there 100 then the world wouldnt be able to sustain life.
Its sad a child didnt get to live their life here on ealrth, but thats all it is "living here on earth". We are just pilgrams passing through. Man created those circumstances. If God suddenly started feeding millions of starving children, people would catch on to the fact these foodless kids arent dying. Thus there would be no concept of faith, (faith in something)-the very thing that drives man. If you have no faith in anything you are simply not alive. The poor child is innocent and thus goes to heaven, suffering no more. This world has evil in it. Its not haven, We were not born into a perfect world of harmony and love, why do you think you should get such a reward with out working for it??? Lifes a test.