The success and achievement of breastfeeding are greatly influenced by several factors. One of the factors that can affect breast milk production is the use of contraceptives, namely the 3-month and 1-month contraceptive injections. The aim of this study was to determine the relationship between three-month and one-month injectable contraceptions with breast milk production in breastfeeding mothers aged 0-6 months in the working area of the Sajingan Besar Community Health Center, Sajingan Besar District, Sambas Regency, West Kalimantan Province in 2025. This study used a cross-sectiona designl. The study sample was 58 breastfeeding mothers who have babies aged 0-6 months. Data were analyzed using the Chi-square analysis test. The results of the study showed that the relationship between the use of injectable contraceptions had a significant relationship with the variable of breast milk production at a significance level of 0.001 (p<0.05). These results concluded that there was a relationship between the use of injectable contraceptions and breast milk production in breastfeeding mothers aged 0-6 months.
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