Not eating. For the next 3 months.

My daughter is 10months old and she is not at all eating rather we give her milk by comepling her. Her weight is 7.1kgs now which doctor tells as underweight. Her birth weight was 2.740kgs. We are struggling badly and wish to have a remedy to make her eat. Also she has cold inside but not emitting out by running nose or flum via mouth or stools. She has the habit of crawling and keeping her fingers in her mouth so I doubt she may be having worms in her stomach. She shows disinterested in any food we feed her. She goes motion even after drinking milk at all times and the motion is too smelly. Kindly help me to get rid of this problem. Drops we give her are : Essential plus - 1 ml Anda Vit - 0.5 ml She wasnt given anything from her birth but the above drops are given from the begining of this month and prescribed to continue for the next 3 months.