I start to offer my chicks nutritious treats at about a month old. Mealworms have been a favorite. I make sure and offer chick grit as well too help them digest their treet. As they get older I'll offer a wider variety of treats. All treats I give no matter the age are organic and nutritious for them. I like giving my older birds organic treats from a company called "treats for chickens" their treats are nutritionally complete and offer a wide range of different ingredients like marigold petals, sea kelp, bee pollen, and oats, flaxseed, alfalfa and much much more. I really like this company because their ingredients are so unique and all organic. I buy mine offline from treatsforchickens.com take a look at the wide variety of nutritional organic treats that they offer. Look at the ingredients in them and I think you will be impressed! My girls go crazy for these treats! Each month I'll buy a couple bags of different treats for them and they love it!! Its nice to offer such diverse ingredients like this company offeres. You should take a look at their website. I like knowing I'm giving nutritional treats. Hope this helps. I wish you the best