Baby Swallow Update

I checked the swallow box again. One of the swallow chicks died. It was lying on the entrance. I took it away so the swallows could get in easier. I thought the swallow babies had fledged because there was about six swallows flying around the box, but I checked again later and heard and saw the chicks in the box. I saw the mouths of the chicks sticking out of feathers and other stuff the adults used for nesting material.