You can start offering grit to baby chickens as soon as you introduce them to solid foods other than starter feed, like vegetables or fruits. While starter feed is usually finely ground, other foods or treats may require more grinding and digestion, making grit necessary for your chickens' digestive health.
It's important to note, however, that some starter feeds already contain grit, so it's important to check the label before offering additional grit. In general, if you notice your chicks straining to poop or if their droppings are loose or runny, these may be signs that they need grit.
Offering grit is an important part of your chickens' diet, as it helps them to properly digest their food and absorb nutrients. When in doubt, it's always best to consult with a veterinarian or experienced poultry keeper for advice on providing the best nutrition for your chickens.