The World Health Organization advocates for breastfeeding as the best source of food for optimal infant development, which reduces the risk of infant mortality and morbidity. The objectives of this study are to evaluate the effect of a father-involvement breastfeeding telephone support intervention on prevalence and duration of exclusive breastfeeding, postnatal depression and parent-infant bonding. The intervention consists of four weekly 20-30 minutes telephone-administered counselling sessions on breastfeeding, delivered individually in the first month postpartum for mothers and fathers. We expect that women who receive the intervention will have a higher rate and longer duration of exclusive breastfeeding, fewer depressive symptoms and better parent-child relationship. The knowledge gained from this study can provide direction for the development of flexible, accessible and culturally sensitive interventions to promote breastfeeding and mental health in Chinese society.