We currently have five 9-10 week olds (breeds in sig). We'd really like one more and there's an opportunity to buy a 3-4 month old pullet. Most posts I've read are about adding younger chicks to flocks. What about adding a slightly older bird? Any tips or tricks there or is this best avoided? We could also possibly get another 9 week old to add but it's not the breed we were hoping for. Would we be better off adding one that's the same age? Or do we really need to go the chick route (which would be tricky because we already dismantled the brooder)? Thanks.