Describe the changes as a baby grows and an adult ages.

There are different types of changes happening when a baby grows and an adult change. These changes are of their physical as well as emotional.  These are classified into different stage for example infancy, childhood, puberty, Adolescence, Adulthood  

Explanation:

The changes in child from a baby to adulthood happens in certain age.  

In the first year they have sense of smelling and hearing. With the help of crying they can communicate.  

The second stage is childhood where child is learning to walk, run, and climb the stairs. They can speak frequently.

Puberty is the third stage where child is sexually mature.

Adolescence is the stage where transition between the puberty and adulthood

Adulthood is not a proper age but generally it considers as starting from 20