When the Prince and Princess of Spain christened their daughter Sofia for instance, her big sister Leonor stole the limelight with her cute antics.
Meanwhile, Mary of Denmark looked like any proud mother as she showed off her twins in 2011 - but the curtseys and bows of the congregation when the royal party passed by give away their true status.
Click on the photo above to see heartwarming images from past christenings.
Watch: Prince William takes George to meet his sister
It's a little princess!