Contemporary feminists deny the vital role mothers play in the healthy development of babies and children.Organisations such as the Australian Institute of Family Studies try hard to pretend that mothers are interchangeable with “stay-at-home Dads” (a species that has never numbered more than a few) or with “community child-care centres” where even small babies would be cared for by strangers.But mothers and fathers are not interchangeable. Each has a special role to play in the lives of childre…