7-year-old girl with 3-D-printed hand throwing 1st pitch at tonight's Game 4 of World Series

"She's just a bundle of energy right now," mom Yong Dawson told ABC News.

— -- A 7-year-old girl with a 3-D-printed prosthetic hand will toss out the ceremonial first pitch at tonight's Game 4 of the World Series at Minute Maid Park in Houston.

The MLB was inspired by her story after many teams responded on social media that they would love to have her throw out a first pitch. The organization last month offered her a chance to pitch during its biggest event: the World Series.

"We're all looking forward to Hailey throwing out the first pitch at Game 4," MLB Chief Operating Officer Tony Petitti said in a statement. "We've already had some memorable first pitches during this Series so far and we know that Hailey's will also be very special."

At 5 p.m. CT today, Hailey will be escorted out to the pitcher's mound by her brother Zach, 12. She will also be revealing her new, specially designed prosthetic hand that has a World Series theme, Dawson said.

Hailey will then watch the game with her family.