Watching for four bluebirds to fledge

I have a birdhouse with four baby birds in it that could fledge any day now, possibly even today. Unfortunately, I have yet to see any of my baby birds fledge. This is the 4th or 5th nest since I put the bluebird boxes up. I hope this time will be different – plan to watch closely. Read earlier posts to learn more about my bluebird houses and nests.