All parents go through the turmoil of their baby crying in a restaurant, on a train or in any public place.
The mom or dad will try to calm the baby, often to no avail, causing some of those disturbed by the ruckus to make a sour face.
After Akiko Shihara, 34, an essayist and mother of two, lived through this experience, she created a sticker showing that the holder is not bothered by a baby's wail.