It does sound like there is a potential food sensitivity if she has stopped growing. I'm sorry, but bfeeding does not mean one stops growing b/c of the milk you are giving her. Anything more than 16oz of cow's milk can cause an iron deficiency. I fully support your decision to bfeed, especially during the cold and flu season, there is a big push from public health officials for new mothers to do this through the flu season!! Other milks you can try is rice, almond and coconut milk. Coconut milk mimicks breastmilk the most because of its high fatty acid count. Lauric Acid is found in breastmilk and the only other place in the world is coconut milk and coconut oil. :)
Other food suggestions is avocados, hummus, beans, lentils, all can be cooked in soups, stews for the winter. You can add 1tsp of flax oil daily for more good fats. And I add Nutribiotics rice protein powder to my 2yr old's milks since those three do not have much protein in them. There is also coconut milk yogurt, smoothies, adding a tsp of a nut butter to her oatmeal to give her more depth to her morning cereal.
I hope some of these ideas help. Be leary of the sugars in processed milks as it does suppress the immune system.
Good Luck!
J. W. MPH
Maternal and Child Health Educator
Chicago Examiner Family Health Expert
http://www.examiner.com/x-7158-Chicago-Family-Health-Exam...