Underweight 9 month old at 13lb 5oz

My daughter was born three weeks early and was 5lb 15oz. She has been struggling to gain weight. She was hospitalized for two days at 2 months of age and nearly gained a pound in a day.  She has a latching problem and doesn't suck well. Unable to suck and keep a binky in her mouth. She eats well. Eats 8oz of formula at a time and for lunch eats two lg jars of baby food. Usually cereal and a fruit.  I try to give her jars with the highest calories.  She is only in 0-3 month clothes and has recently been called in a store anorexic.  It is so cruel to say that about someones child that you don't even know.  

[Renee Radenberg]

Her weight is below the 3rd percentile. Suggest giving her an extra bottle of formula (if you can); give her meat, vegetable, and fruit baby foods for lunch and dinner; and the cereal and fruit for breakfast. As a guideline for a 9 month old child should eat the following: Dairy 3-4 feedings a day – Milk (6-8oz), cheese (½ oz), yogurt (½ cup). Starch 2 feedings a day – Infant Cereal (2-4 Tbsp), pasta (3-4 Tbsp), bread (½ slice), or crackers (2). Fruits & Vegetables 2-3 feedings a day – Fruits (3-4 Tbsp- including 100% juice limited to only 3ozs) & Vegetables (3-4 Tbsp). Protein source 2 feedings a day – Meat (3-4 Tbsp), or beans (¼ cup). She should eat 3 meals and have snacks between meals using the foods above to be spread out throughout the day. She will get extra calories to help her gain weight.