A pre-school age child with a congenital heart defect is brought to the clinic by the parent because of a fever and an earache. During the assessment, the parent asks the nurse why the child is at the 5th percentile for weight and height for age. Which response is best for the nurse to provide?

A. "Haven't you been feeding according to recommended daily allowances for children?": This response implies blame and lacks sensitivity. It doesn't acknowledge the child’s underlying medical condition that may affect growth. B. "Does your child seem mentally slower than his peers also?": Intellectual development is unrelated to height/weight percentile in children with congenital heart disease unless there are neurological complications, which haven't been indicated. C. "You should not worry about the growth tables. They are only averages for children.": While growth charts are averages, they are clinically significant, especially for identifying underdevelopment in children with chronic illnesses. D. "The smaller size is probably due to the heart disease.": Chronic hypoxia and increased metabolic demands in congenital heart disease often contribute to poor weight gain and growth delay, making this the most informative and empathetic response.