Perhaps this is partly because of the genetic conflict between baby and mother: the baby, 100% related to itself and only 50% related to its potential brothers or sisters wants to strip the mother of the maximum of resources. The mother wants to give it only its share of her reproductive potential. This conflict has lead to certain genes in the mothers dna producing small, placid babies and certain genes in the fathers dna promoting large, active babies (actually identified only in rats or something so far: reasonable to expect it to be present in (some) humans).
If non-monogamous breeding is a significant presence, and if it favours dominant males (heads of major international financial institutions might be an example) then the pressure is on males to grow big, smart, important and strong (even if their mother goes into a terrible decline and gets osteoperosis).
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