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Kids' lids are commonly made from plastics such as polypropylene and from silicone; some listings show combinations like silicone plus polypropylene.
Listed age ranges vary from infant/toddler stages through preschool, with examples including around 6 months, 12 months, and 3 years and up.
Many kids' lids are labeled for cold beverages; some items specify they are suitable for both hot and cold drinks.
Pack counts vary widely: single replacement lids, small multipacks (2–6 pieces), and bulk cartons with 1,000 lids are commonly available.
Many lids use rotating flip covers or caps to cover the straw or spout, keeping it sealed and clean when not in use.