Responsive feeding serves as an important protective factor for infant growth and overall health development. This study based on self-determination theory (SDT) aimed to assess the effects of a responsive breastfeeding (RBF) intervention programme on maternal breastfeeding and infant growth and development. A total of 110 mother-infant pairs were recruited and randomly divided into an intervention group (n = 55) and a control group (n = 55). The primary outcomes were breastfeeding motivation score, breastfeeding self-efficacy (BSE) and exclusive breastfeeding rate; the secondary outcomes were infant physical development at 6 weeks and 3 months. A repeated measures ANOVA indicated that the intervention group had significantly higher Enjoyment scores compared to the control group at three time points: at discharge (MD: 5.28; 95% CI: 3.68 to 6.89; p < 0.001), 6 weeks post-partum (MD: 5.06; 95% CI: 3.80 to 6.31; p < 0.001) and 3 months post-partum (MD: 5.24; 95% CI: 4.12 to 6.35; p < 0.001). Similarly, the intervention group reported significantly higher connection and mother's self-perception scores at discharge (MD: 4.31; 95% CI: 3.07 to 5.56; p < 0.001), 6 weeks post-partum (MD: 4.69; 95% CI: 3.71 to 5.68; p < 0.001) and 3 months post-partum (MD: 4.93; 95% CI: 4.14 to 5.72; p < 0.001), compared to the control group. In contrast, the pressure from significant others scores were higher in the control group relative to the intervention group at discharge (MD: -2.09; 95% CI: -2.88 to -1.31; p < 0.001), 6 weeks post-partum (MD: -4.35; 95% CI: -5.20 to -3.49; p < 0.001) and 3 months (MD: -4.89; 95% CI: -5.70 to -4.08; p < 0.001). Finally, the intervention group also reported higher Instrumental Needs scores at all three time points: at discharge (MD: 1.96; 95% CI: 1.35 to 2.58; p < 0.001), 6 weeks post-partum (MD: 3.58; 95% CI: 3.05 to 4.11; p < 0.001) and 3 months post-partum (MD: 1.18; 95% CI: 0.68 to 1.69; p < 0.001). BSE scores were significantly higher in the intervention group compared to the control group at discharge (MD: 14.29; 95% CI: 10.38 to 18.21; p < 0.001), 6 weeks post-partum (MD: 14.04; 95% CI: 11.05 to 17.02; p < 0.001) and 3 months post-partum (MD: 6.80; 95% CI: 4.66 to 8.94; p < 0.001). The rates of exclusive breastfeeding were higher in the intervention group than in the control group at each stage of the intervention (p < 0.01). At 6 weeks post-partum, the intervention group's infants showed slower weight (t = -0.90, p = 0.371) and length (t = -0.69, p = 0.495) growth compared to the control group, though not significantly. By 3 months post-partum, there was a significant difference in both weight (t = -3.46, p = 0.001) and length (t = -2.95, p = 0.004) between the groups. The findings in this study suggest that the RBF intervention programme based on SDT may be effective in improving mothers' motivation to breastfeed, building breastfeeding self-confidence and increasing the rate of exclusive breastfeeding. The effects of the intervention on infant physical development will need to be verified with longer follow-up in future research.

Maternal & child nutrition

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