Mrs Smith brings her son Jimmy, age 15 months, to the office…

Mrs Smith brings her son Jimmy, age 15 months, to the office for a well-baby exam.  During your patient history, Ms Smith reports that Jimmy is babbling but not saying any words.  He started walking at age 12 months.  Eats some table food. He is in the 75th percentile for height and weight. His past medical history is negative for serious illnesses, but he has had recurrent otitis media because he is in day care and is exposed to many sick children.  From what we know about growth and development, what concerns, if any, do you have about Jimmy?