Babies are worked with to pose the moment they start jumping of of the box.
every other night they come in for 30 minutes to do some posing practice, and snap update photos for the website.
I look them over at 4 weeks, and try to make cuts for faults I can see coming in. (Length is a HUGE problem in my nethies. Anything *starting* to look wrong is scrapped as brood or pet.) General DQ's are also looked for at that time.
At 8 weeks, I try to make final cuts down to keepers. If I'm having a problem, and have the space, I'll grow out what I can to 10~12 weeks. Generally I don't have the space, and fight with myself for a few days over who stays/who goes. LOL!