Really? My husband is a superb father who spends virtually all of his free time with his children, but he does not consider my staying home an "immensely advantaged position." Rather, he views it as God's plan for our family. If God had intended him to care for infants in the home instead of me, he would have given him breasts to nurse, for starters. :)
According to that illogic, women who couldn't nurse would be less-capable mothers.
And before you claim biological superiority as usual, have you heard of a lady named Andrea Yates? Susan Smith?