pubis

So I'm trying to find out some numbers on chickens and egg laying. If a pullet lays it's first egg at 18-20 weeks, at what age do they start laying regularly? Would an 18 week old who has laid it's first egg lay another the next day? I would think not but someone please correct me if I'm wrong.

To familiarize myself with a normal chicken's rear end is like I occasionally probe the rears of my chickens when I hold them, and today both of the 5 month old Waffle's pubis bones have a sudden, sharp bend to them that I've never felt before and his brother from the same hatch doesn't have...