I have 6 hens, all are about 20 weeks old. As of today, 5 are laying. 3 of them all started laying just this week so I suspect the last one will be laying soon. But I have been finding eggs that have a hole in them. The hole is just in the shell, i don't think it punctures the membrane. I've been noticing this since the 3 started laying. I want to make sure this is just young chickens being curious and pecking them and not some kind of other animal getting in there. I also want to know if they will grow out of it.