I agree with playfelt.

I have a 20 month old, who was very coddled when she first came to me in November, always wanting to be picked up, keep me within sight etc.

I would say "you're okay_______, let's go play with ___________"

or...

You're a big girl, show me how you can play."

I too say, its not time for up, that comes when we read a story.

It'll get better, but don't give in kay?