Yes, you are absolutely allowed—and often encouraged—to bring your own snacks for kids on a cruise, provided they are non-perishable and factory-sealed. Most cruise lines (like Disney, Royal Caribbean, and Carnival) allow you to pack items like granola bars, crackers, dry cereal, fruit snacks, and chips in your carry-on or checked luggage. This is a lifesaver for parents of picky eaters or for toddlers who need a snack at 3:00 AM when the buffets are closed. You are strictly prohibited from bringing "home-cooked" goods (like a bag of homemade cookies) or fresh fruits and meats due to international agricultural and biosecurity laws. Once on board, you can also "stock up" on small boxes of cereal or fruit from the breakfast buffet to keep in your cabin's mini-fridge for later. Just remember that you generally cannot take these snacks off the ship in foreign ports of call due to those same strict customs regulations regarding "unprocessed" food items.