His weight is on the 50th percentile and his height is above the 95th percentile for his age so he is not underweight which is good. At 11 months he should be eating finger foods and regular foods cut up in small pieces and he should be feeding himself (with his hands and possibly with a spoon) at 3 meals a day. Suggest trying a 'sippy' cup instead of the bottle, at meals, for his formula or milk to help increase intake. 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). If he does not want the bottle then give him more food 3 times a day with snacks between meals so he is getting the proper nutrition.