Review Question - QID 109258

A girl presents to her pediatrician for a well-child visit. Her mother reports that she is eating well at home and sleeping well throughout the night. She can jump and walk up and down stairs with both feet on each step. In the doctor’s office, the patient builds a 6-cube tower and imitates a circle. She seems to have a vocabulary of over 50 words that she uses in 2-word sentences. The patient enjoys playing near other children and sometimes argues over toys with her older brother. Her temperature is 98.6°F (37°C), blood pressure is 92/56 mmHg, pulse is 106/min, and respirations are 23/min. On physical exam, she appears well developed and well nourished, and she is following along her growth curves. The child is assessed as developmentally normal. Which of the following is an additional milestone associated with this child’s age?