There is no way to increase your chances of mutations its just with luck, I recommend gathering a large amount of eggs and hatching them all at once. This wont increase your chances but you will get at least 1 mutation out of 50 eggs. When i dino is in baby faze you must hand feed it untill juvenile, when a dino reaches juvi it can eat out of a trough whic means you dont have to sit there. There isnt a difference between adolescent and juvenile. I recommend watching a youtube video on how to breed dinos properly without mutations.