What if one baby robin remains in the nest?

If one baby robin remains in the nest while its siblings have fledged, it may indicate that it is not yet ready to leave due to being less developed or weaker. The parent robins typically continue to care for the remaining chick, providing food and protection until it is strong enough to fledge. If the chick is healthy, it will eventually leave the nest when it is ready. However, if it appears to be abandoned or struggling, it may require human intervention to ensure its survival.