I don't know if i say this enough to everyone i know who owns a pet with a problem, Bitter Apples.
Get it at Petsmart, if your baby is licking at your guests' feet, if they don't mind, ask them to allow you to spray a bit of Bitter Apples on their feet, or you can spray it on a napkin and have them rub it on their feet. THEY HATE the taste and will learn not to.
April started picking up a habit of chewing her peepad, what did i do? BITTER APPLES! I sprayed bitter apples on there and she's cured.