Generally, kittens can start eating cat treats around 3-4 months old. However, different brands of cat treats may have different recommended age ranges, so it's best to check the instructions before feeding them.
It's important to note that cat treats are snacks and don't provide a complete nutritional profile; they shouldn't be a cat's main food. Furthermore, while cat treats come in a variety of flavors, they are processed snacks, and excessive consumption can easily lead to picky eating habits in cats. This is especially true for kittens under 3 months old, whose digestive systems are weaker and less efficient at digesting cat treats; eating too many may cause vomiting or diarrhea.
