Comparison of exclusive breastfeeding rate at 2 weeks, 1 month, 4 months and 6 months after delivery: chi-square test; breastfeeding self-efficacy and perception of family support: mothers' perception score of family support at 2 weeks, 1 month, 4 months and 6 months after delivery was statistically described by mean ± standard deviation; changes in breastfeeding self-efficacy and perception score of family support at different time points were analyzed by repeated-measures analysis of variance.