My six babies are going to be 3 weeks old this week. I've moved them to a larger brooder and feed them "solid food" such as chopped hard boiled eggs, mini crickets, and such. They now chase each other, peck at each other, and even jump up with "spurs" up at each other. They are causing no harm (yet) and it's kind of cute. They still all cuddle and sleep together when all is said and done. These are my first ever chickens and it's fun watching them grow.