In short the mental and physical development is faster than any other humanoid found in the material plane. Moreover, the age 3 of Dragonborn is equivalent to age 10 of a human being. The younger lots grows very quickly as they can walk within few hours after hatching. From this post you can know kalashtar 5e and more about it. It indicates that the character is not only strong but is studded with a very high degree of endurance. In addition, the charisma score displays an increase of one point.
Dragonborn 5e has impeccable strength therefore it can increase the score of the game with 2 points.
