My 4 month old daughter has suddenly lost appetite some 3 weeks back and has reduced intake considerably. She has completed 4 months and had a healthy weight till last month. She used to get frequent vomit while drinking milk itself. She used to drink mainly formula milk. Now since last 3 weeks she is taking merely 400 to 500 ml in 24 hours, otherwise she used to take 700 to 800 earlier weeks. Her current weight is 6 kg. Doctor suggested to use domstal drops but it's not helping much. Anyone can help, we feel helpless?