- Japan Rail state that you need a child Rail Pass for children aged 6-11 years only.
- Children under 6 years do not need a Rail Pass, but without a Rail Pass they may only occupy a seat if it is not required for a fare-paying passenger.
- If you want your infant aged under 6 years be able to occupy their own seat, you should buy a child Rail Pass for them. This is particularly recommendable at busy times.