A bird has to lose its down before it can fly, from what I’ve seen (I watch live bird cams). It will need to be kept warm, if you decide to remove it from its nest. Today being Saturday might be a problem for finding a rehab person, but if there’s a vet open or a zoo nearby you can call, you might be able to find a person who will care for it in order to release it into the wild. They do “wingersize” in order to get ready, but they have to be sleek for the flight and strong enough.
The parents are likely regurgitating the food at this point, so hard seeds would probably not help. Check the internet for info. There might be some good advice for the type of bird you have. Songbird might be good enough of a description.
Well, I’ve seen the parents on the fence. Most of my garden is in the backyard around this porch.
And from the looks of it, they are bringing him back live food. Grubs and caterpillers and the like.
So I was wondering about worms - I have a mondo compost pile back there and if you dig down a foot, there are billions of those red worms everybody says to use in your garden. Seems like they’d be just about the right size, this bird doesn’t look big enough to handle a good sized nightcrawler!