The mother's first meeting with the baby after the caesarean section is usually delayed due to the reasons arising from the mother and the baby in Turkey. Although there are many benefits of kangaroo care (KC) intervention between the mother and the newborn, there is a limited number of studies on the KC intervention between the newborn and the father after caesarean section in international literature, and there are none in Turkey. This study was carried out to determine the effect of fathers and infants who participated in KC, immediately after birth by caesarean section, on paternal-infant attachment and the fathers' involvement in infant care in the 12th month. The study was conducted as a longitudinal study with a control group. Initially, the sample consisted of 60 fathers. However, the study was completed with 48 fathers. KC intervention was practised to the couple of the father and the infant in the experimental group, while no practice was given to the control group. Fathers in the experimental group were told that they should continue to practice KC intervention at least two times a week until their baby will be 1-year-old. The data collection forms were given to fathers face-to-face in the first interview, and then through phone calls and emails after 12 months. The status of the fathers in the experimental group fathers' involvement in infant care of the baby (p = .005) was significantly higher than the control group. The mean score for the Postnatal Paternal-Infant Attachment Questionnaire (PPAQ), in fathers who participated in KC intervention, was higher than that of fathers who did not participate in the KC intervention (p < .005). The results of this study demonstrated that the paternal-infant attachment and the fathers' participation in infant care were more positive in fathers and babies who performed the KC intervention.