November is SIDS awareness month, and Japan's guidance now has four points

The Children and Families Agency runs a SIDS campaign every November, ahead of winter, when SIDS is more common. This fall it added a fourth point to its list of ways to lower the risk: don't let the baby get too warm.

Its check is simple. Feel the baby's chest, and if it is sweaty, adjust what the baby is wearing or the room temperature. The other three points are unchanged: put the baby down on its back until age one, breastfeed where you reasonably can, and stop smoking.

Our full guide Baby Sleep in Japan (添い寝): What the Guidance Says →

Source: Children and Families Agency