From the measurements you wrote, both her weight and height are below the 3rd percentile for her age unless there is an error. If her weight has been decreasing and you are concerned, then suggest going for a second opinion. As a guideline for a 9-12 month old child should eat the following: Breast-milk or Formula (6-8oz) 3-5 feedings a day, Dairy 1 serving a day – cheese (1/2 oz) or yogurt (1/2 cup). Starch 2 feedings a day – Infant Cereal (2-4 Tbsp), bread (1/2 slice), crackers (2), or pasta (3-4 Tbsp). Fruits or Vegetables 2-3 feedings a day – (3-4 Tbsp). Meat 2 feedings a day – 3-4 Tbsp) or beans (1/4 cup). Suggest staying with the formula you are using presently, and when she turns 12 months old use Pediasure, nutrient dense drink, in place of milk if her weight is still in the lower ranges of the growth chart for additional calories and protein for growth.