my son 19 months old boy had a gut infection and under antibiotics medication for 4 days... more worries is he is not accepting food for 4 weeks only milk....

A. Because of an infection and medicines you are giving this kind of a thing can be seen so I would advise you to start with a B complex supplement that really helps a lot in maintaining the appetite of the child otherwise otherwise for the time being you can start giving a supplement which will help in aggravating the hunger of the child you can ask your doctor if you can give a supplement called Aptivate