Glad they're doing so well Katy-may, they sound lovely. Maybe hold off on those earthworms, though, as they can act as a host to the sort of worm eggs which affect chickens. (Chicken eats earthworm, worm eggs in earthworm's body hatch in chicken's gut and cause chicken to lose condition and become ill if not treated, then worms lay eggs which pass out in chicken's droppings, fall on the ground and are eaten by earthworms, and so on, round and round...) Probably not a big worry for you at present if your garden hasn't had hens in it yet, but maybe a bag of dried mealworms would be a lovely idea for your chicks' Christmas stocking?
There's a thread in the Chickens Health section, at http://poultrykeeperforum.com/viewtopic.php?f=35&t=483 telling you more than you wanted to know about chicken worms and how to treat them. Many people give them their first worming dose of Flubenvet at around 18 weeks old, I believe. The breeder I got some chicks from this year told me to treat them shortly before they joined the big girls at about that age.