Mitsuhiro Sato (R) carries his three-year-old his son Kiichi at their home in Tokyo June 27, 2010. Japan's fathers spend less time on child care and housework than their counterparts in any other developed conutry. But thanks to a new set of government initiatives that encourage working dads to take time off -- part of broader effort to boost Japan's rock-bottom birthrate -- the number of fathers who swap their desks for diapers may be about to rise. Picture taken June 27, 2010. To match Reuters Life! JAPAN-FATHERS/ REUTERS/Issei Kato (JAPAN - Tags: SOCIETY BUSINESS)