Hello:
My family will be in Japan this June and we are planning several train trips. We are traveling from Tokyo to Hiroshima, Hiroshima to Kyoto, Kyoto to Nara as a day trip, and from Kyoto back to Tokyo. We have a family of 6: 2 adults and 4 children (ages 12, 11, 9 and 3). We are interested in the Green/1st class Japan Rail Pass. If we want to be sure our 3 year old has a seat, should we purchase a child ticket for her as well? Or is this not possible for her to get a pass because she is under 6 years old?
Also, how soon can we reserve seats in the Green cars after we purchase the Japan Rail Pass? Is this only possible after the passes are activated in Japan or are we able to choose seats in advance on the internet or using an app even before we arrive in Japan?
Thank you for your help!

