Comparative Advantages in the Home

NYTimes magazine has an article on equality in parenting. Interesting, particularly the bit about the negotiations in same-sex marriages with kids. I've always wondered though if any economist has applied the "comparative advantage" theory of international trade to parenting. (The idea is that, all other things equal, two countries who trade with each other will end up specializing in the product/service which they're best at (even though their best may be worse than the other).