This may help a little, gives you a basic idea of what you need to write about..
It is important to know the difference between the sequence and the rate of development as it gives us direction when it comes to monitoring child/young persons needs during stages of their school years. We can then plan effectively to make sure the child receives the help and support they need in areas they could find difficult. E.g. Physical development should follow a specific pattern; a baby of 0~3 months should be expected to move their head, arms and legs before being able to lift their heads at 3~6 months. A child of 4 should be writing their names and drawing basic pictures before moving on to more complex tasks of joined up writing at around the age of 8.
The sequence of child development is common amongst most children but what often changes is the rate in which they develop. Therefore it is important that we monitor this in order to put in place definite methods of intervention or help they need in order for their development to progress in whichever phase of their learning they are struggling in.