The boy, who has not been identified, was sitting behind Atlanta's first-base dugout Tuesday night when he was hit by Gomez's liner in the seventh inning. Gomez looked toward the stands with concern, while Braves pitcher Julio Teheran crouched on the mound and grimaced. The boy was hustled up the aisle and later was transported to a hospital.
"Just went to see the young fan that was hit by my foul ball last night," Gomez wrote Wednesday on Twitter. "He was in great spirits and I had a chance to sign the ball."
Gomez also said, "You don't like to see anyone get hurt, especially a child. Fans, please be alert and bring your glove!"
The Braves released a statement wishing the victim "a speedy recovery" and saying the family had requested privacy. No additional details on his condition were released.
Shortly after the game, the Braves said the child was "conscious and talkative." He was treated by medical personnel at the stadium before being taken to the hospital.
Teheran was clearly shaken by the incident, though he bounced back to pitch a six-hitter. Atlanta beat the Brewers 5-0.
"That was scary for me," Teheran said. "I knew it hit somebody. It was fast and hard. No one had a chance to get out of the way."
He sent his best wishes to the child.
"If anyone knows him, please let him know I hope he's fine," Teheran said.