I'm guessing my baby Green Singer is between 3 - 4 weeks old already.
The plants over, alongside, and in the cage are regular plastic plants purchased at Michaels (the big craft store). I wonder if they made the parents feel safe enough to breed?

His father does sing.
As for the banding, I was able to practice on 7 baby Ringneck Doves before this finch and they are
much easier!
So far, he mostly just sits alot. His parents are much more active. They might even be courting for the next batch. This time, I'm going to write down when the mother starts incubation so I can estimate the babie's ages better.
Some things I learned about Green Singers: Although you can see the hen incubating, you hear and see very little else when they have babies. They are very quiet babies - you don't hear much of anything when they are feeding them - if I hadn't reached in the nest to band him last weekend, I wouldn't have noticed any babies until he left the nest (although, he was a single baby and could crouch down better I guess).
As for baby food, the parents took my home-made egg food (mashed hard-boiled egg with corn meal, vitamins, and Miracle Meal) and live mealworms - and possibly some dry egg food and dry insect mix. They also had millet spray, finch seed mix, greens and sprouted seed available. But I never actually saw them feed the baby so I'm not sure what they fed it versus what they ate themselves.