When I reflect on my studies so far, I think about the different milestones of development that we study in order to understand the whole child.  We look at what is typical for different stages and ages and we use that information to help guide instruction, to help inform parents and to simply provide support for young children and their families.  The above quote signifies that no matter what is typical for an infant, or child to do by a certain age, one should understand that children are unique and in their own way they will make gains.