Chickens of all ages need grit to help them digestion their food.
As chickens do not have teeth, they need grit (basically little rocks) to help break down and digest their feed.
Even if your flock is free range and finding grit in the yard, we recommend supplementing their feed with grit to avoid digestive issues that are common without grit.
Offer your chickens a grit free-choice in a separate container. Remember to always provide them with clean, fresh water.