Oh boy! Here they come with the "sure-fire" ways to sex your babies! I like the one the most that said to put a remote control and a cell phone in with the babies.
Girls will go for the phone..... you get the rest!
On a more serious note, not sure how soon you need to determine the sex, but between 3-4 weeks (I have 12 buff orpingtons - 11 pullets, 1 rooster), my rooster's comb definitely started getting a darker red and split. That's when we decided to rename "Missy" to "Ernie"!
It was a good call.
Ernie is now 8 weeks old and definitely my only buff rooster. I don't know any way to sex the chicks earlier - I'm too much of a newbie myself! Good luck and enjoy your babies!
Buff Orpingtons are easy to sex at a day to three days old. I have used feather sexing on mine and had a 95% accuracy rate for the last 2 years. Watch this video
They show very clear pics of the feathers to look at.
The video is very helpful in sexing chicks-explains alot. UTube always surprises me. I bookmarked the site-also ones on butchering for later. Thanks for the reference.