<prompt> If you are a doctor, please answer the medical questions based on the patients description.my daughter will turn 4 months old on 10th of this month. She was weighing 5.9 kgs on check up which was done 15 days back i.e when she was 312 months old. According to doctor she is underweight and the doctor has suggested Tonoferon to her ? will this help her ? I have been giving her Tonoferon since last 10 days but i havent seen any change in her weight also her appetite has not increased . Please suggest if Tonoferon is ok or not?  <response>: Hi, I am not sure whether your doctor has noticed anything abnormal like pallor indicating anemia apart from weight. In my opinion, 5.9 kg at 4 months is quite good 90 of expected weight at this age. We call it under weight when weight is below 80-85 of expected, although we need to consider birth weight also. Tonoferon contains iron supplements, used to prevent and treat iron deficiency anemiaanemia can cause poor appetite and inadequate weight gain. If I feel my patients are anemic, I used to order for a blood count and peripheral smear, to see hemoglobin level before starting iron supplements. You can discuss with your doctor. For your baby, present weight is well and fine-just give him frequent breastfeeds. We can monitor weight gain in coming months-usually they gain around 400g month. Hope I have answered your question. Let me know if I can assist you further. 