Iceland has a system similar to what you're describing. The mother gets three months, the father gets three months, and the couple gets another three months to

Iceland has a system similar to what you're describing. The mother gets three months, the father gets three months, and the couple gets another three months to share as they see fit. It's been a rousing success with 90% of fathers taking all three months. Compare that to Denmark where every couple gets ten(ish) months of leave that can be used by the mother or father as they see fit. Danish women take an average of 9 months off while Danish men take an average of 1 month off.