Parents bring their 6-month-old son to see you. he is symmetrically less than the 5th percentile for height, weight and head circumference. he was born at 30 weeks’ gestation and weighed 1000g. he was a planned pregnancy, and his mother’s prenatal course was uneventful until an automobile accident initiated the labor. he was ventilated for 3 days in the intensive care unit but otherwise did well without ongoing problems. he was discharged at 8 weeks of life. which of the following is the most likely explanation for his small size? a. chromosomal abnormalityb. protein-caloriemalnutritionc. normal ex-premie infant growthd. malabsorption secondary to short gut syndromee. congential hypothydroidism