A 3-year-old child from rural Maharashtra is brought to the primary health centre with a 6-month history of poor weight gain, loose stools, and recurrent respiratory infections. On examination, the child weighs 10 kg (expected 14 kg for age), has visible ribs, sparse hair, and mild hepatomegaly. Serum albumin is 2.8 g/dL. The child is alert and feeding normally. What is the most appropriate immediate next step in management?