My 1 year 8 months baby doesn't like eating anything. He is mostly on milk. Worried what to do?

We prepare every food we believe he would love to eat but he barely eats anything. He has not been eating solid meals for last 2 months and getting weak day by day. He is only drinking milk throughout his days. Consulted with doctor as well and they suggested to feed him while he is playing or in good mood but nothing is working. What should we do now? We are worried. #pleasehelp #1stimemom #advicepls #firstbaby