When the chicks are new and tiny, they feed them whole, fresh, soft, small, larvae and spiders. They don't regurgitate food. As the chicks grow, they gradually increase the size and toughness of the insects they offer.
A hundred or so worms offered morning and evening would be adequate for a pair with a box of nestlings a week old. The rule of thumb is to offer about 15 mealworms per bluebird once or twice a day, as a supplemental food, unless severe weather conditions limit natural sources.
It's not necessary to feed birds but it's fun to watch nature up close, and you'll be amused at how quickly a relationship develops between you and the bluebirds!
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