A 2-day-old neonate born to a 38-year-old primigravida presents with poor feeding, hypotonia, and a single palmar crease. Clinical examination reveals a flat facial profile, upslanting palpebral fissures, and a protruding tongue. Karyotype confirms trisomy 21. The parents are anxious about the child's future and ask about management. What is the most appropriate immediate next step?