In a statement released by the team, the Yankees said "the child who was struck with a batted ball today was given first aid at the ballpark and is receiving medical attention at an area hospital" and declined further comment.
It's not the first time this season a spectator has been injured at Yankee Stadium.
An Aaron Judge foul ball hit a male fan in July, causing him to need medical attention and in May, a young boy was hit in the head by a Chris Carter broken bat and left bloodied. A source said the team would continue to look into installing extra netting.
The decision to increase netting is up to individual teams. The New York Mets extended the netting down the first and third-base lines following the All-Star break this season.
In addition to the Mets, Atlanta, Houston, Kansas City, Minnesota, Philadelphia, Pittsburgh, St. Louis, Texas and Washington also have extended netting.
Major League Baseball sent out a memo prior to the 2016 season "encouraging" teams to have "netting that shields from line-drive foul balls all field-level seats that are located between the near ends of both dugouts (ie the ends of the dugouts located closest to home plate, inclusive of any adjacent camera wells) and within 20m of home plate."