A 6-month-old girl is brought to the primary health center in Delhi for immunization. The health worker measures her weight as 5.2 kg and length as 62 cm. Her birth weight was 3.2 kg and birth length was 50 cm. On plotting on the WHO growth chart, her weight falls at the 25th percentile and length at the 50th percentile. The mother reports exclusive breastfeeding and denies any illness. On examination, the infant appears well-nourished, alert, and with no clinical signs of malnutrition. What is the most appropriate next step?