Any pediatricians in here? Have an important question

Serena

My daughter just turned 2 and had some blood work done because she only 22 lbs and isn’t gaining weight. She’s been a horrible eater since she was born. Never wants to eat. Anyways the pedi ordered blood work to make sure her thyroid and everything was working properly. However in the blood work they found her neutrophils to be moderate low. For her age it’s supposed to be at 1500 but hers is at 704. I need more advice please I’m panicking. Does anyone have experience with this with their own child or a doctor that knows more info on this???