Set up of coop and run matter way more than size of chick.and the bantams are still too small.
If they’re “several months” old, they’re not going to get any bigger. How long do you plan to keep them separated? If you’re concerned about their size, maybe a separate coop for them would be something to consider.Yes they are with older chickens now and the bantams are still too small.
Small is actually an advantage, my chicks get full run and coop access at about 2 weeks. Because they're so small I can use their small size to help provide hiding spots that only they can get into.Yes they are with older chickens now and the bantams are still too small.