My baby girl is 50 days old. Her weight is only 3.95kg. She is feeding well for 40min in every 2-3 hours. She was admitted in hospital when 3days old for fever and was on antibiotics for 5 days as well as other medications. She is otherwise healthy. we are additionally feeding her 30ml formula 3 times a day since last week. What can I additionally do to get her to a healthy weight?