OBJECTIVES/GOALS: Micronutrient deficiencies contribute to poor health and childhood development outcomes. The objective of this study was to examine the independent and combined effects of responsive parenting and multiple micronutrient supplementation interventions on preschooler hemoglobin and ferritin concentrations in southwestern Guatemala. METHODS/STUDY POPULATION: We enrolled 387 preschoolers (36-52 months) at nutritional risk (height-for-age z-score < -1) (51% male; 17% indigenous ethnicity) in a double blind, 2 x 2, cluster randomized controlled trial. Participants in the parenting intervention received culturally tailored responsive parenting or nutrition education (control) curriculum, delivered over 6 home visits. Participants in the nutrition supplementation group received daily supplementation with a maize-soy product fortified with 21 micronutrients for 6 months or a control product fortified with vitamin B2 only. Linear mixed models were used to estimate changes in hemoglobin and ferritin from baseline (2015) to endline (2017) in a subsample with blood specimens (n = 218). RESULTS/ANTICIPATED RESULTS: At baseline, 14% of preschoolers were iron deficient and 11% were anemic. Preschooler ferritin significantly increased over time in most arms, with the largest increase in the combined responsive parenting + multiple micronutrient supplementation arm (ferritin = 95.6 (95% CI 46.4, 144.74); rates of change did not differ between study arms (p = 0.16). Preschooler hemoglobin did not change over time. Further analysis will examine the moderation of intervention effects by pre-specified child and household factors. DISCUSSION/SIGNIFICANCE: Increases in preschooler ferritin did not differ between intervention and control arms. There was no effect of the intervention on hemoglobin. Future analyses will examine intervention effects on pre-specified subgroups including baseline micronutrient deficiencies.