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Abstract Background Health service providers closely monitor the developmental state of toddlers to identify the factors affecting this process because any defect during this period will cause irreversible damage. Therefore, this study investigated the relationship of nutritional behaviors and parent–child interactions with the developmental domains of Iranian toddlers. Methods This cross-sectional, descriptive-analytical study was conducted on 341 toddlers aged 12–36 months covered by comprehensive health centers in the south of Tehran in 2021–2022. The participants were selected through single-stage cluster sampling. To this end, 16 comprehensive health centers were randomly selected, and then some of the clients from each center were randomly selected as the sample. The required data were collected through the Ages and Stages Questionnaire (ASQ), the Children’s Eating Behavior Questionnaire (CEBQ), the Child-Parent Relationship Scale (CPRS), and a demographics form. They were then analyzed statistically using descriptive and inferential statistics in SPSS-21, considering a significance level of p