I'll have to go back to find pictures of my Welsummers when they were chicks. I purchased three as pullets, and two of the three turned out to be cockerels. What I didn't know then that I know now? The largest of the three, all of them day-old at purchase, turned out to be the lone female. As stated earlier in this thread, she was slightly darker with more defined eyeliner than the two boys. However, it wasn't until they really hit about 10-12 weeks that I knew without a doubt I had two males in the mix. The pinkish-salmon color of the female's breast was really gorgeous, and her feathers had a stippled look to them that the boys didn't have. And of course, as they reached the "preteen" weeks, the boys started getting wattles, where the little hen did not. All three were purchased at a local feed and garden center, with the pullets having been sexed at their hatchery in the SW before being shipped.
Luckily, I was able to re-home one of the boys with a chicken owner looking for a Welsummer rooster, but I still have one of the boys and the hen. Even if they aren't show quality, they are gorgeous, friendly birds.
Let me go find those pictures for you . . .