C onstipation is defecation that occurs twice a week. According to Riskesdas in Indonesia in 2018, around 42.3% of children aged 0-5 months had received MPASI and 84.5% were given formula milk. Complications that can occur if children consume solid food early and formula milk are digestive tract infections, allergies, diarrhea, constipation..METHODThis research is an analytical observational study with a cross sectional approach with inclusion criteria of babies aged 0-6 months. The research was carried out by filling out questionnaires on early solid food, formula milk, and constipation. Sample selection was carried out using the consecutive non-random sampling method with a sample size of 79 people. The data was processed and analyzed using the Chi Square test with a significance level of 0.05.RESULTSIn this study, the results showed a significant relationship between giving early solid food and the incidence of constipation in babies aged 0-6 months (p = 0.026; p < 0.05) and the relationship between giving formula milk and the incidence of constipation in babies aged 0-6 months ( p = 0.016; p < 0.05).CONCLUSIONEarly provision of solid food and formula milk is associated with the incidence of constipation in infants aged 0-6 months