Magic self-Dissilient Dinosaur Egg (1). Color: GREEN, with Hatchery Dome Kit Ready to Hatch a New Born Baby Dinosaur. by MHX SCIENCE Discovery Biology Science Fun - Hatching Dinosaur Egg and Hatchery Set. Hatchery Dome size: H3.8 W 2.6 From egg to infant in about 20 minutes (dinosaur type will differ therefore size and color too). Kids will be amazed to learn that dinosaurs actually hatched from eggs. Learn about dinosaur types and details. See the actual hatching of the pretend egg with an emerging infant at birth. Change with fresh water for infant to develop to about up 8X after about 3 days or so. See the actual hatching of the pretend egg with an emerging infant dinosaur at birth Ready to take the baby dinosaur out of the hatchery to discover the new world to play.