My chicks are 2 weeks old too... and they definitely have doubled in size!!! They also double what they eat, too... the feed is flying out of the bag.
They grow up so fast! My babies have mostly adult feathers already...
Kinda like dropping a gummy bear in a glass of water overnight!
I just went in to check the food and water for my three weekers only to find that about half of them had escaped the box and were wondering all around the store room! Prolly looking for food as their feeder was empty... again!
I'll have to go do a close head count to make sure I caught them all!