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How old is the rooster, how old is the child, what was happening when the roo attacked, etc. Too many variables to just say "cull it". Is the roo going through his adolescence? Is the child a very small child and thus seems a "threat" or "rival" or "intruder" in the eyes of the roo? Was something else happening that had the flock upset? IMHO some people on here are WAY too quick to say "cull" i.e. "kill" when some rehabilitation will work wonders on lots of roos ESPECIALLY if they've "always been friendly" as you say yours has. GIVE HIM A CHANCE! Read RoosterRed's page on roo behavior/rehab, separate him from your child or vice versa, and give the roo a chance to grow up if he's not already mature. If he is, a little behavior modification may make all the difference in the world.
I'm a big believer in rooster reform, however 99.9% of the time it's only me and my SO on this farm and we both know how to deal with it. If on one of the rare visits from the kids either of my roosters were to go after our GS, he'd get one chance because I'd allow for variables that caused it; GS chasing them or wearing a certain color (Zeus hates the colors pink or red). The second time it happened I'd cull him and quick.