This is all from a stated "Pitt source"
-Pitt was drunk
-there was a fight between him and Angelina and one of the kids came between them
-"a parent-child argument which was not handled in the right way and escalated more than it should have"
-insists he did not hit the child
-he did put his hands on the child because they were nose to nose and it was spiraling out of control
-calls it "a fight in which Brad was somewhat inebriated got out of hand and reached a regrettable peak" before saying Angelina's "manipulating" the story to gain custody
I strongly encourage reading it, because the actual quotes basically admit to everything, then act like Angelina's a vindictive bitch for wanting physical custody