Happy Belly Essential Oil Blend smells faintly of black licorice with a sweet undertone. Happy Belly Essential Oil Blend relies on its Fennel constituent to relieve occasional digestive discomfort and soothe your child’s tummy ache. The Black Pepper constituent also promotes the smooth functioning of the colon and helps relieve bloating in the digestive tract. This blend is part of our Kids Line Collection. The roll-on comes pre-diluted at a two percent dilution and is safe to apply topically on children who are two years or older.