Hi, a warm welcome to the site.
You need to think about the different ways you observe children's development in your setting eg. do you use tracking sheets? post-it notes, checklists, learning journeys?
You can look at the different types of observations on
page 366+ of this EYE handbook ( search inside the amazon preview for the words 'observation methods') and on this thread
http://www.silkysteps.com/forum/showthread.php?t=14832
Hope this helps, best wishes