<prompt> Please answer with one of the option in the bracket. Write reasoning in between . Write answer in between .Q:A 7-day-old male infant presents to the pediatrician for weight loss. There is no history of excessive crying, irritability, lethargy, or feeding difficulty. The parents deny any history of fast breathing, bluish discoloration of lipsnails, fever, vomiting, diarrhea, or seizures. He was born at full term by vaginal delivery without any perinatal complications and his birth weight was 3.6 kg 8 lb. Since birth he has been exclusively breastfed and passes urine six to eight times a day. His physical examination, including vital signs, is completely normal. His weight is 3.3 kg 7.3 lb; length and head circumference are normal for his age and sex. Which of the following is the next best step in the management of the infant?? A: Reassurance of parents, B: Emphasize the need to clothe the infant warmly to prevent hypothermia, C: Evaluation of the mother for malnutrition, D: Supplementation of breastfeeding with a appropriate infant formula, E: Admission of the infant in the NICU to treat with empiric intravenous antibiotics,  <response>: This is a question about managing weight loss in a newborn infant. The key points from the stem are: - 7 day old male infant with weight loss since birth - No concerning symptoms or signs on history or physical exam- Exclusively breastfed, normal urine output- Birth weight 3.6 kg, current weight 3.3 kg - Length and head circumference normalThe weight loss of 0.3 kg or 300 g since birth represents about 8-9 loss from birth weight. This amount of weight loss is common in newborns in the first week of life as long as the infant is otherwise healthy and there are no signs of dehydration or inadequate milk intake. The choices include reassurance, keeping warm, evaluating the mother, supplementing with formula, and starting antibiotics. Based on the information provided, there are no signs of hypothermia, maternal malnutrition, or infection that would warrant any intervention. The infant is breastfeeding well with good urine output. Therefore, the next best step is simply reassurance of the parents that this amount of weight loss is normal and expected.A: Reassurance of parents 