Why did MLB teams wear yellow ribbons on their jerseys on September 2?
Major League Baseball players, umpires, and on-field staff wore yellow ribbons and wristbands for all the games that took place on Friday, September 2.

Yellow ribbons and wrist bands were spotted all over the baseball field at all MLB games held on Friday, September 2. All on-field personnel including players, umpires, managers, and coaches bore the symbol as the league marked their Childhood Cancer Awareness Day.
Major League Baseball has raised awareness of childhood cancer for the seventh consecutive year.
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MLB’s Stand Up To Cancer campaign
“MLB and Clubs have supported the fight against cancer through a variety of initiatives for many years,” according to a statement by the league.
“As Stand Up To Cancer’s founding donor, Major League Baseball and its Clubs have pledged more than $50 million to SU2C’s collaborative cancer research programs, providing invaluable support. Launched in 2013, the work of the Stand Up To Cancer – St. Baldrick’s Foundation Pediatric Cancer Dream Team has helped develop new treatments for difficult to treat pediatric leukemias which have been approved by the FDA.”
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MLB is also holding pre-game ceremonies which involve participation of children and conducting virtual visits from players and mascots as part of its campaign to support the fight against child cancer.
They will also donate Nintendo Switch handhelds to local children’s cancer hospitals or hospital pediatric cancer care units.