I’m looking for a children’s teaching/therapy type book. It is a paperback with a blue cover. I’m guessing that it was printed in the 2000s, but I’m not sure.
The book is about a small cloud who is happy with his cloud mom until one day he wants to go exploring on his own. (I feel like the cloud was a boy but I’m not sure.) 
His mom says it’s okay so he goes off and soon runs into a group of cloud children. There’s a ringleader and the other clouds follow him/her and do what s/he says. He thinks they’re fun at first until they go higher and higher in the sky. He gets a funny/bad feeling in his tummy that tells him that this is wrong. He tries to break free from the group of clouds, who are being sucked together by the ringleader into one big dark cloud, but he finds that it’s difficult to get free. The other clouds are laughing at him. Then he draws on all of his strength, shouts “no!” (or something similar) at the clouds and he’s free.
He returns to his mom and tells her all about what happened. She responds by saying that she knew he was strong enough to do what was right (or something like that).
I’ve spent several hours entering different phrases into Google to try to find the book. I hope you have better luck that I’ve had.