Getting a baby to eat

Ari

so my daughter is 6m and her pediatrician says that she’s a low weight at 14.5 pounds. she told me i have to up her bottles to 6, 6 ounce bottles a day and 1-2 solids a day. i’m trying so hard to meet this but how do i offer a baby milk or food who’s clearly refusing it and only drinks 3-4 bottles and two meals a day? like im not even meeting the 36 ounces a day for her. im only getting her to 24 ounces. does anyone else have this problem? am i doing something wrong or is the pediatrician’s request ridiculous? i just don’t know.