The sequence of development
A sequence of development is the series of development a child follows such as learning to crawl before learning to walk.
The rate of development is the speed it can happen for instance their head movements and getting grips to holding up their head independently instead of having to leaning on somebody’s chest for support.
Is the rate of development the same for every child?
It realistically varies from child to child; every child is unique to the specific development. Development varies from child to child because there may be different circumstances, such as they may have siblings so their development may be quicker because they see or hear vocabulary around the house compared to a child that maybe an only child who only hears limited words and sees certain things may have a lower rate of development.