Two years passed since Zack has been reborn in that world… since the beginning, he kept his guard up in case of attacks, but they never happened. That being said, he made full use of his abilities to recover his strength as fast as possible. He couldn't do much aside from using the Quest System to recover his strength, though.
As a baby, his actions were limited, but the skill recognized that and granted him tasks that could grant him some XP as long as he completed the quests.
Quest: Roll Over
Description: A small but significant step in your development. Roll over from your back to your stomach.
Reward: 10 XP
Quest: Grip an Object
Description: Strengthen your grip by holding onto an object for 10 seconds.
Reward: 15 XP
Quest: Babble Coherently