When you start Egg Baby you will be given a yellow-to-purple gradient egg with horizontal stripes. This egg will become a sample for you. All you need to do is follow the instructions that the game provides in order to care for it. This egg takes no time to hatch, even though later your record book will tell you that the same kind of egg (the Dummy Egg) takes more than six days.
When this egg hatches you will receive a Pinata and the tutorial stage will be over. The Pinata will give you a bottle of water (food item) every 8 hours. Description: "Ah, the Pinata.These majestic creatures can be found roaming the flowering plains of Fiestany spreading cheer and joy across the land. Don't expect them to be great conversationalists though."
Quick note: These water bottles do not accumulate on their own; you have to harvest them and then the timer will restart for another one.