they will be a medium size....some chicks will be bigger than there siblings but they will all be bigger them the rooster and small than the hen...and because the rooster is so small the eggs may not be fertilized and even if the are if the eggs start developing the chick may not survive due to the egg being much bigger that the chick...the chick may drown before hatching....but bantam standard mixes are done all of the time so I am sure it will be fine.