"Kid Tested, Mother Approved": Mothers have long been the victims of social pressure when it comes to their skills. And giving your child cereal in the morning is always a battle between kids that want sugary junk, and mother that want healthy grains. Kix cereal has acknowledged this with their tagline, "Kid Tested, Mother Approved".
"Mother Approved" helps give real live mom's the feeling that they aren't compromising by choosing Kix - they'll get a cereal their kids will love without sacrificing nutrition. It also gives them the social proof that other mothers have "approved" Kix as a healthy choice.