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I reported on it last year, and as of yesterday, it’s been made official. The New York Yankees and the New York Mets each have to contend with only 13 pitchers on their pitching staff (5 starters, and 8 relievers), and each pitcher must face a minimum of 3 batters if brought in at the start of an inning.
September/Double Header Rules
In the instance of September call ups, or doubleheaders, you can add a maximum of one pitcher to your 13 man staff. The chiefest exceptions to the three batter rule are if a pitcher is brought in and gets hurt or sick on the mound.