As the nurse assessing miguel’s growth and development, what is the most appropriate nursing action to address his inadequate weight gain ?

The Canda family brings their 6-month-old infant for a well-baby check-up. The baby, named Miguel, was born full-term and has been exclusively breastfed. The parents report that Miguel is active, responsive, and has been meeting developmental milestones. During the assessment, Miguel’s weight gain is noted to be below the expected range for his age.