I don't know the reasoning behind the rules. I think it's safe to say that almost no couples distribute their parental leave so that the biological mother has l

I don't know the reasoning behind the rules. I think it's safe to say that almost no couples distribute their parental leave so that the biological mother has less than 10 weeks leave, and few have significantly less leave for the mother than the father. It's probably just an artifact of some sort; it has no practical significance. I'm pretty sure that the 49/59 weeks include delivery though.