The cost of reproduction hypothesis suggests that current reproduction has inherent tradeoffs with future reproduction. These tradeoffs can be both in the form of energy allocated to current offspring as opposed to somatic maintenance and future reproduction (allocation costs). or as an increase in mortality as a result of morphological or physiological changes related to reproduction... https://www.diegojavierfares.com/mega-grab-Victorian-Green-and-Gold-Masquerade-Mask-huge-savings/