Don't stop feeding them. I have noticed that the birds often bring their young down and feed them in the garden and sometimes when they have a nest of youngsters the parents are exhausted and like something easy nearby! However don't put down whole nuts - they can be put into a nut feeder or crushed.
I find that the bird feeders are really popular during the spring and summer. Even if the adults don't feed this food to their young they use it themselves to keep going to find enough food for their chicks! Also, if you are a seed eater there aren't that many seeds about in spring and summer. I usually find that attendance at my feeders dies away in autumn when there is a lot of natural food about. They soon come back in the winter though!
No keep feeding them. Birds get used to feeding in the same place and if there is no food then they may stop coming and it will take them some time to come back once you start again in the autumn
When everyone says that the birds would choke their chicks to death if you leave out whole nuts I think you are wrong. I think birds understand that thoe big nuts are too big for their wee chicks and will crack it down to size. I don't think their that daft!