Reading the description of the egg in its current state, Milo's eyes widened in surprise. He wasn't sure what could've caused it to hatch so fast, but he could've sworn it wasn't this close to hatching when he first received the egg from the man running the cup game. Seeing that it was close to hatching also caused him to panic, he had nothing prepared for when the egg hatched. All he could think of was to ask the system what caused this, and suddenly Navi could be heard inside his head.
"It is an additional effect caused by increasing the Beast Whisperer ability's level. At a high enough level, hatching speed of beast eggs that are imprinted on is significantly increased. If raised enough, it can even allow the beast within to grow at an accelerated rate"
