Our chicks are due to arrive April 17-19. We'll keep them in the coop/brooder for a 8-9 weeks, then introduce them to the covered run. We'll let them run in the covered run and coop during day, andl be kept in the coop at night. We may be taking a vacation (8 days)in late July, early August, and would have petsitter care for them during our absence. Would chicks be ok to leave in care of petsitter (who has cared for chickens) when they are 3-4 months old? Can't help but be a little worried about leaving them!