The 2020 edition of the Maternal and Child Health (MCH) book can facilitate pregnant women in monitoring supplementation obedience and labour outcome. There are still few studies that discuss the effectiveness of the MCH book with regard to labour outcomes. This study aimed to determine the effectiveness of the new edition MCH book on obedience to iron supplementation and labour outcomes. The study used a quasi-experimental, non-equivalent control group design. The subjects were pregnant women in the second trimester until labour. The sample of this study comprised 60 people in the intervention group and 61 people in the control group. Research analysis was done using T-test and chi-square tests. The results showed that supplementation obedience increased haemoglobin levels, affected duration of labour in the first and second stages and the amount of blood loss during labour, and the APGAR scores were significantly different in the two groups (p-value >0.05). However, the intake of protein and iron-rich food, placental membrane integrity, duration of the third stage of labour, uterine contractions, APGAR score in the first five minutes, and birth weight did not show a significant difference in the two groups (p-value >0.05). The study concluded that the self-monitoring sheet for iron supplementation in the MCH book could improve obedience and haemoglobin, and thus improve labour outcomes, but it does not increase maternal food intake.