For a smooth transition into 5K 
All day Kindergarten is a big transition.  Here are a few tips to help with separation and the many adjustments your child is making. 
Establish a set routine at home and stick to it. 
An early bedtime is fantastic.  A 7:30 bedtime works well in Kindergarten. 
Start the day with a good breakfast. 
Be excited for what they will learn and experience each day.   
Practice independence at home (tying shoes, opening snack items, eating lunch in a timely manner) and encourage independence.