As the nurse conducting the evaluation, what is the most appropriate nursing action to address sofia’s weight gain and development concerns ?

The Joaquin family brings their 6-month-old infant, Sofia, for a well-baby check-up. Mrs. Joaquin expresses concern about Sofia’s weight gain and development milestones, particularly in comparison to her older siblings at the same age. Sofia is bottle-fed and currently weighs 7.5 kg, which is below the expected weight for her age.