Effect of Peppermint Water on Breast Crack

Inclusion Criteria: * New mothers with healthy term infants (38 weeks gestation or more) are eligible for recruitment into the study. The sample of breastfeeding mothers were collected in two cohorts according delivery type. Each group consisted of 98 primipara mothers. Exclusion Criteria: * Mothers who didn't plan to use peppermint water * Discharged before an interview or had preterm delivery * Postpartum fever * Breast infection * Nipple abnormalities * Age less than 18 years * Twins * Taking medications at night * Mothers who didn't have telephone line, and who were illiterate. * Infants who used bottle-feeding or pacifier, or who had mouth infection, or an abnormal short frenulum.