What are the rules for the size of the MLB roster

MLB shortens season due to ongoing pandemic - The Patriot

The 2020 MLB season is now in full swing, but it's not what anyone would have ever expected.

As early as March, when COVID-19 worsened in the USA, many sports leagues had to cease operations prematurely for reasons of the health and safety of players and fans. Many have since returned, and that includes Major League Baseball.
However, things were very different.
There are usually 162 games for all 30 teams in the league. This year the league removed 102 games to increase security for the teams. This means that the 2020 MLB season only has 60 games. This reduced the amount of travel each team would have if they had a busy schedule.
At the end of the regular season, the Los Angeles Dodgers were the team with the most wins from both leagues. Of the 60 games they won 43 and lost only 17. Meanwhile, the hometown of Baltimore Orioles won 25 games and lost 35 games for their season.
Another change for the Major League Baseball season this year was for the fans. There weren't any in the stands. Every single team has closed the stands in their stadiums to prevent the spread of COVID-19.
The only way to watch games was to watch them on TV, safely and in the comfort of your home.
Another important change was the size of the rosters. Teams could invite up to 60 players to practice, but they could only have up to 30 players on their active opening roster. This was a small step up from the normal expanded roster size of 40.
Eight teams are now preparing to compete in the playoffs in both the American and national leagues. Four teams from both leagues will advance to the Division Series. After that, two teams from both leagues will advance to the League Championship Series. After all, the two winners of both championships will compete against each other in the World Series.
As we near the playoffs for Major League Baseball in 2020, no one can imagine who will be the World Series champion this year. Everyone also agrees when fans can go back to the stadiums in the future.