I cannot figure out how to edit my previous post, so I had to start over. Worried brooder is too small & they can hurt themselves as they jump & try to fly. Chicks are 2 and 3 weeks old. They are getting really active & hit the walls a lot! One injured her neck yesterday but no one saw it happen, we wondered if they are too crowded. thanks! the brooder is made of 2 plastic tubs. H = 30" W = 30" D = 20"