Baby weight

Just curious how is everyone baby doing with his/her weight? My baby was 19.4 lbs at 9 months check up. He’s been losing weight and now he’s 11 months he only weight in at 18.5 lbs. we brought the baby to see the dr today and she was very concerned and it makes me so worried. She ordered a chest x ray, blood work and stool. And we’re gonna go see feeding therapist too because he’s pretty not eating much solid. Most of the food is ended up on the floor or he just put in his mouth and spit it out. We’re hoping there’s nothing wrong with his liver or kidney to make him not wanted to eat. Any suggestion on what you feed your baby is greatly appreciated too because I literally running out of idea what to cook for him. He can’t be this picky at this age right?????!!!!