This is a loaded question. "society should value" and "pay more" are separate arguments. By agreeing to the first I'm not agreeing to the second. I think society should value taking time off to raise children, yes. However, I don't think that society should value a corporate attorney doing this more than a public defender doing it. To do so would value raising children unequally. A universal basic income with an additional stipend for child care would be one solution that captures this difference.