In normal cases the sequence of development depends on pervious events which had happened previously.
For Example a baby first starts to roll, thereafter 6-7 months they try to sit, soon after they start crawling using their legs and hands. Next stage at the age of 1yrs they will try to stand holding things, try to walk holding parents hands and f ianlly they reaches a stage of succession where they can walk independently.
Rate of Development
It is a quantity of something in comparison with a unit of another thing. Rate of development varies child to child. Each and every child has a different rate of development. Although they follow more or less the same pattern of rate of development. For Example: Some babies start teething from 6 months and some of them start even at 9 months .some babies can start making sentences at around 1 Yrs but in some case at the age of 1 yrs and they only can speak few broken words.
Importance of Differences
Sequential development is the sequence of development . this means that you must finish with one of area of development before you move on to the next one. The rate of development is the pace that a child develops, these can be the pace within each sequence or the pace over all and goes to cover all the set areas or period in between or altogether in the sequence.These principals run through all the areas of development from physical, social, intellectual and language no matter what the age of the child.. If at all one is skipped or is slow it can be a cause for concern and may lead to a child being given a special recommendation or having a special need in or outside school. Development and growth is a kind of continuous process but still they differ and varies...