There is always confusion about pitch counts during the spring because Leagues often introduce stricter pitching rules (max innings or max pitches). Regardless of this, these are the days of rest that must be observed.
PITCHERS LEAGUE AGE 14 AND UNDER MUST ADHERE TO THE FOLLOWING REST REQUIREMENTS:
IF A PLAYER PITCHES 66 OR MORE PITCHES IN A DAY, AT LEAST FOUR (4) CALENDAR DAYS OF REST MUST BE OBSERVED BETWEEN OUTINGS. IF A PLAYER PITCHES 51-65 PITCHES IN A DAY, AT LEAST THREE (3) CALENDAR DAYS OF REST MUST BE OBSERVED BETWEEN OUTINGS.
IF A PLAYER PITCHES 36-50 PITCHES IN A DAY, AT LEAST TWO (2) CALENDAR DAYS OF REST MUST BE OBSERVED BETWEEN OUTINGS.
IF A PLAYER PITCHES 21-35 PITCHES IN A DAY, AT LEAST ONE (1) CALENDAR DAY OF REST MUST BE OBSERVED BETWEEN OUTINGS.
IF A PLAYER PITCHES 1-20 PITCHES IN A DAY, NO CALENDAR DAY OF REST IS REQUIRED.
A lot of people think 40 is the magic number, partly because in the past, 40 was the magic number for 2 days rest requirement. That is no longer the case. The only reason 40 pitches is important, is if you want your pitcher to catch afterwards, they may not pitch in excess of 40 pitches.
Also, any catcher who have caught for 4 or more innings cannot pitch for the remainder of that calendar day.
MAX PITCHES PER DAY BASED ON AGE
LEAGUE AGE
13-16 -------- 95 PITCHES PER DAY
11-12 -------- 85 PITCHES PER DAY
9-10 --------- 75 PITCHES PER DAY
7-8 --------- 50 PITCHES PER DAY