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In world war 2 industrial mobilization was more important. An example of this can be seen with the german reich. Germany at the beginning of the war had stockpiles of equipment to rely on and were a powerhouse that nearly won the war before the United States even entered however as they started getting bogged down their stockpiles dwindled and their industry could not keep up ultimately resulting in their downfall. Another reason for this is the fact it is easier to send allies equipment than it is to send them men.
Industrialized nations have numerous societal and economic advantages that are not available to underdeveloped nations. Most industrialized nations have the most current technology, highly educated healthcare professionals, routine exposure to prenatal care, and the presence of a healthcare worker at birth to handle any complications. Citizens of industrialized nations also are comparatively more financially equipped to utilize these resources. Finally, both mothers and healthcare professionals have regular access to education that allows for a successful birth.