I think I need to be handed a grip.
DD is 3, and at a lovely little local nursery, been there since 13 months when I went back to work. She's now one of the oldest kids, and her friends are slowly going off to pre-school nursery.
She's been offered a place at a pre-school and whilst it seems lovely I feel like crying about her leaving her little cosy nursery world where she is now 
Can't explain why, but saying goodbye to the amazing people that have looked after makes me so sad! I do know she can't stay there forever. Might look a bit odd having a 10 year old at nursery 
Disclaimer: I'm usually tough as old boots so this feeling comes as a surprise! Does everyone feel like this about their childs' first setting when they leave?
Disclaimer 2: I have a 10 week old so am hormonal too 
