Placebo effect on a child

I've observed the placebo effect on my daughter who is now 6 years old. She believes that band-aid is a remedy for pain. She asks for a band-aid for all her scratches and even for bruises. After she receives the band-aid she always seems much calmer, happier and less concerned about her injury. I think she formed this belief based on books and cartoons and possibly some practices in the daycare she attended. In many children's books and cartoons, you can notice a certain pattern in the story. First, you see a character upset and emotional about their injury. Then someone, who can be perceived as an adult, applies the band-aid. After that, a character is shown happy, cheerful and no longer upset or worried about their wound. I think this contributes to a child forming an idea that band-aid is a key factor in moving from being upset to being happy after getting physically hurt. As I mentioned above, I did notice the positive changes in my daughter's mood after she gets a band-aid. I can contribute these changes to the care she receives while being treated, to her being able to share her emotions with someone and get comforted, and to her belief in band-aid's special healing power that results in a shift in her attitude and behavior.