I found a dead baby robin in my yard?

Baby robins when accidentally leaving the nest as soon as they fall on the ground and walk around their nest scent wears off so the mother doesn't know if she owns it. So the baby is on their own forever which is bad since they can't get their own food and can't fly either. So it died of hunger or if it ws still featherless that means he may have died of weather conditions. So I am verily sorry you couldn't save the baby robin and it wasn't your fault for not helping it because you didn't know. May the baby robin rest in peace...