Baseball in Tokyo

Hoping to see a game on either the 24th March or 10th April...
What is the best way to buy tickets as a foreigner?
Do we need to buy tickets for children? (aged 1 and 5).
Many many thanks.

You had to search before post here.
https://www.japan-guide.com/forum/quereadisplay.html?0+109483

Each team web have a guide of ticket info in EN.
http://npb.jp/eng/
http://npb.jp/eng/teams/
But now a bit early, the schedule info of both season in EN has not been updated yet.
You can check it in Japanese page's game calendar, use Google translate.
http://npb.jp/preseason/2018/schedule_detail.html
http://npb.jp/games/2018/schedule_03_detail.html
http://npb.jp/games/2018/schedule_04_detail.html

Thank you very much for the response.
Do you know if we can take babies/have to buy them a ticket?
And is there a child's ticket price for a 5 year old?
Looking like it's about $122 AUD a ticket.... does that seem right?
Thanks.