Hi a very warm welcome to the site. Transitions can affect children's development in many ways, emotionally when a situation becomes stressful and their confidence is affected. This means they might not want to join in with something they'd otherwise find interesting and miss out on learning - physical and cognitive development.
This thread may help
http://www.silkysteps.com/forum/showthread.php?t=13920&
or if you
have this level 3 handbook pages 61+ are good reading
Best wishes xx