Baby bird II

Having done some more reading about baby birds, I'm now not at all sure we did the right thing last night. This afternoon the bird was joined by one of it's siblings, equally small, equally sweet, but with a bit more energy (still not able to fly though.) I feel terrible now that we took the bird in and fed it bread in milk, both things which the majority of websites say you shouldn't do. It is still there, and it is still cheeping, but it still looks so helpless and small and just not quite as.....right as it's brother or sister. It is so tempting to take it back in again and try to look after it but I'm not going to.....by all accounts it is now of an age where it should be hopping about on the ground. Perhaps it just came out a day or two too early, or perhaps it is my fault. I hope it survives, but I don't know that it will (apparently only one in five baby birds survive, I read earlier.) I'm just not cut out for all this nature stuff - it all seems so harsh.