I have 6 O.E. bantam / b. brahma cross hens with a flock of standard hens and a standard roo. They are not full size but they are definitely not bantam either. Just mid size hens. I got them in hopes of them being claimed by my bantam Amer. roo, which did happen and I was totally happy that things went as I wanted them to. Anyway my question is just a question. What would happen if you tried to hatch eggs that were fertilized by a standard roo and a half bantam hen? Would the chicks get too big for the egg shell size or could they hatch?