You need to keep in mind that death is not the same thing as annihilation. God has never destroyed/annihilated any person He created. People are God’s creation and thus belong to Him. It is His moral right to take them when He deems fit. Now you ask why would God take a baby? Of course God does not answer to you; He is not obliged to tell you His reason, but He always has one because He is ultimately moral. We could speculate. One reason might be that God knows the future that the child would have had in this world, one leading perhaps to great wickedness that God has mercifully decided not to unleash on the world, nor the greater eternal torment for the child as a result of such wickedness. You may not emotionally like the way God rules His universe, but there is nothing illogical or immoral about it as you had claimed. You are not in a position to evaluate whether God had sufficient moral reasons for His actions because (1) you are wicked not righteous, and thus your view of morality is necessarily distorted, (2) you cannot see the “big picture” – only God has all knowledge, and (3) you have no basis for any sort of objective morality apart from God by which you could judge Him