Baby weight

Just out of curiosity....

My daughter is 9 months old and last weigh in she only weighed 18 pounds. She eats lots of solid foods, in fact we call her a food monster she likes food so much, plus she takes bottles between meals as well. Everyone I talk to says she is light weight and they are surprised because babies younger than her and her age weigh more. I'm a first time mom and it makes me worry that shes not getting the nutrients she needs. She was born 10 days over due at 8 pounds 1 ounce and no health problems what so ever. We see her doctor tomorrow and I'm going to be asking him about it (he has never said anything about being concerned about her weighed before so 🤷‍♀️). Any of you other mamas have petite babies??