I never see the babies until about 2 weeks after fledging. The parents take them away from nesting site to seek a safer location. Sometimes, I see the parents get worms in the interim & take them off to the babies, but not near as much. Some people don’t see the parents at all in the interim. Plus, birds don’t come to feeders as often this time of year. My bluebirds are residents all year round, so I see them at feeder off & on all year.
Lastly, sadly, all of my babies don’t make it through that period. Someone on this site once said that’s why they have several babies in more than one brood. However, there have been others to see all of their fledgers/juveniles back later. Really hope you see them in near future!
Nicole