C-K-READY is the first major, national cluster-RCT to evaluate impact of CenteringParenting on child outcomes at 24 months of age. CenteringParenting is a group well child care model that aligns with The American Academy of Pediatrics' Resilience Project, which encourages pediatricians to promote child resilience and health by building social connections and enhancing parent knowledge about child development. C-K-READY will compare two evidence-based clinical care models: individual well-child care vs. CenteringParenting or Group Well Child Care.