Many people like to play baseball even after growing up. But they are not good enough to play in a professional league, so they have amateur leagues for fun. Most major cities will have recreational league and if you are looking for one, you will need to call up the city. Do a search in the Internet for Parks and Community Services for your city name, or Parks and Recreation. Here is an example on a small city of Lynnwood. In the search engine, I type, 'Lynnwood Parks and Recreation'. You should see some links and they should have phone numbers. Call that number and ask how you can join a baseball team.
Most of the time, your son might have friends and they will sign up with your permission. But if you have to find it, you can use the sentences we have learned right above to find a team for your son.
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