Something I gotta give major props to the Pit Babe stylist team and actors is creating believable versions of the characters when younger. Pete and Babe in particular. Often in flashbacks its very difficult to buy the characters are younger if played by the same actor. But not in Pit babe. They look like teenage (ish) versions of themselves.
Hair is left fluffy and natural with bangs to make faces look rounder when young, opposed to the hair gel heavy (and i think darker dyed) looks of older that show off matured bone structure.
Clothing is baggier to make their bodies look more small and lean, while as adults Babe rocks tanks and Pete fitted suits that show off broad shoulders and muscles.
The actors even move and talk differently. I've noticed in the younger scenes they tend to hunch in their shoulder and talk softer, compared to standing tall and being more commanding in their tone.
Overall they are physically showing how the strong shells of these characters hide a soft young heart that just wanted to be with their best friend.