Onster,if the nest is nearby,I would put them back.
I had a baby-Robin here,he was able to fly a little,but the next morning,he was only a pile of feathers.:sad:
As usual Robin's build very shaky nests,very visible,as yours is..
The parents will try to protect the babies,but often to no avail.
Chances are they will try to fly out of the nest again,but I would still try to put them back,but that's only my
.