Simple well wishes to the parents of a new baby include "Congratulations," "Happy for you" and "So excited." When writing a well wishes card for a new baby, the writer can address it to the entire family, the new parents or even the baby, notes Hallmark. A warm closing such as "with love" or "much love to you" can be included at the end.
For writers who want to include longer messages, the well wishes card can be a time to express more personal congratulations, according to Hallmark. Examples of longer messages include "Warm congratulations on the birth of your sweet baby girl!" "You are going to be terrific parents" and "Welcome to the world, baby! So happy that you're here!"