Surprises Kid After Father's Death

Touching moment on the baseball field Tuesday ... Aaron Judge took time out of his pregame warmup to surprise a little kid who's dad just recently died -- and their meeting was awesome.

Kellen Wilson's father, Kyle -- who attended Judge's alma mater, Fresno State -- tragically passed away last October at the age of the 36 ... and Judge was so moved by the story, he sent the kid a jersey a few weeks later.

But when Aaron's Yankees made the trip to Wilson's hometown to play the A's on Tuesday ... it was unclear if Judge would be able to meet up with Kellen in person, especially after the team bypassed pregame batting practice.

But Judge made the time to go seek out Kellen anyway ... and the two…