When does everyone usually start to put bedding in their chicks cage? Mine are four days old, and are getting disgusting.
Mine get bedding from day 1. I use small shredded paper mixed with pine shavings. They get dirty pretty quickly. Depending on the number of chicks you have, you might have to change the bedding every day or two. When I had 8 chicks I was cleaning twice a week. With 20 chicks they needed to be changed daily.
At around 1 week of age I started to put fine grass hay in their brooder. It works for bedding and also teaches them to forage. I can buy a bale from a local hay guy for around $4 and it lasts for over a month.
My broody hen with chicks hatched hers in the hay. They have been sleeping it in all along and are just starting to peck and it and eat some of the seeds. Some of my hatchery chicks were allergic to the hay and it made them sneeze. They outgrew it eventually. They hay and paper and shavings I can dump in the compost pile so it is very convenient.