What is the most appropriate nursing diagnosis to address the parents’concern about julia’s social and emotional development ?

2-month-old Julia’s parents bring her to the clinic for a routine check-up. They are concerned because Julia does not yet smile or coo at people. Julia is calm, makes eye contact, and tracks objects with her eyes. However, her parents are anxious because they are unsure whether her lack of vocalizations and social smiles is within the normal range.