Suggest Medication To Increase The Appetite Of An Infant

My child is 1 year 1 month old and oly 8 Kg. Her birth weight was 3 Kg. She is a very fussy eater from the beginning . She doesn t use to drink much milk now same with solids . She doesn t eat much and sometimes even after a gap of 5 hours she doesn t seem hungry. Can I give her some medicine to increase her apetite? My pediatrician doesn t suggest anything and forces me to force feed her that I don t want