I found this article interesting. It has charts showing the traits parents most use to describe their babies (you can also access a PDF explaining the study more in-depth). The trait most used by Australian parents: happy. Before you click on the article, what trait would you think is most used by American parents to describe their babies?

http://www.theatlantic.com/international/archive/2013/04/how-parents-around-the-world-describe-their-children-in-charts/274955/

ETA: People are sharing their answers and responses below, so don't read the comments yet if you want to be surprised!