Hi Thankyou for your query. Children who drink more then 500 ml milk in a day are likely to have iron deficiency anemia. Also, due to poor diet he will be deficient in other vitamins. Start him on multivitamin syrup and iron syrup. But diet improvement is most important. Reduce the milk quantity and child will feel hungry , gradually will accept normal diet. Make him sit on the table with others while eating. No such syrup that increases appetite His growth chart has to be monitored , kindly keep a record of 6monthly weight and height. Hope this is helpful Regards Dr sanjukta bose