All SANYO / HOKURIKU SHINKANSEN trains have multipurpose rooms. Although customers with disabilities have priority, ask a crew member if you would like to use a room for breastfeeding. Also, the western style toilets on the SANYO SHINKANSEN have diaper changing tables, and western style toilets on the HOKURIKU SHINKANSEN have baby beds.
Certain limited express trains on conventional lines also have multipurpose rooms and diaper changing tables as well.