Poor Appetite

Hello! Recently Lo had tonsillitis, then ngayon naman nagka sipon. Dati na sya picky eater ngayon walang gana. Water and Milk lang mostly pa konti konti pa sa Milk. ? She is taking vitamins naman po and meds. Pero eating talaga niya problem ko. So frustrated na since bumaba na timbang niya. What to do? ?