Growing Dinosaur Egg is a novelty toy; simply submerge the toy egg completely in a glass of room-temperature water. The outer shell will crack open within 12 to 24 hours, and the toy dinosaur inside will expand to its full size over the next 48 hours. Features About Novelty Toys Dinosaur style and colour may vary. When placed in water, the shell slowly opens and, after 24-48 hours, reveals a dinosaur. After the egg shell is broken entirely, add fresh water to the container. Your pet will continue expanding for 48-72 hours. After 72 hours, you can move your pet to a larger container and watch it continue to grow daily. Materials: made from a combination of durable non-toxic plastic and bio-gel material. The product is CE certified and complies with the EN71 standard. Ages: 3 yrs+ Made in China Novelty toys deliver a surprising mix of cognitive, emotional, and social development perks disguised as simple, low-cost fun. Many novelty items, like water-expanding polymer critters, rely on basic scientific principles. The unique textures, shifting weights, and visual anomalies of novelty items offer high-value tactile inputs. Because novelty toys are inherently unusual, they function as exceptional social icebreakers.