Hi Adam, thanks for sharing. Your babies are beautiful.
If you read the first post, you will see that I have taken over feeding the babies because the parents abandoned them. They were not going to feed them (even though both are good parents). Usually this means something is wrong with the babies -- they got dumped out of the nest and chilled so maybe that was it.
Just for future info, you can clean nests and nest boxes for your birds without harm. This is contrary to what you might have heard, but domesticated birds are ok with you handling eggs, babies, and nests. I generally line mine with paper towels, and when it is dirty I lift all the nesting material with the paper towels, toss, and replace. I give the parents new nest material and within a half hour they've set it up to their satisfaction. Do this only a couple times during the nest period.
Also, you might want to avoid string as nest material ; it can get hung around baby feet and cause big problems. Try clean hay, newspaper shreds, and bits of burlap no larger than 2 inches.
You are right that boiled egg is great for babies and nesting parents. It offers good protein for all. Not sure why you're serving lettuce? For the water content, maybe?