Baby birdie

I am worried about a birdy at my house. Birds like to make a nest on top of the wreath on the front of my house ...well I peaked at it this weekend...Well..yesterday it fell. When I ran home in between work and our schools talent show...the wreath was on the ground, but the nest was still on it pretty secure....the baby bird was in the pine straw on the ground. I picked it up gently and but it back in the nest and re-hung the wreath. I haven't seen momma bird AT ALL since then..Will she come back for him???

Anything I could feed the baby? The eyes aren't open yet. It seemed so fragile in my hands....