The primary objective would be to avoid the protein in cow's milk that is triggering these allergic reactions.
If you have been breast-feeding your child and would like to continue that then, you must eliminate cow's milk and cow's milk products from your diet. This also includes avoiding anything that is derived from cow's milk such as casein, whey and lactose.
Breast-feeding mums who avoid cows milk products , should ensure that they have enough calcium in the diet.
It is advisable that you should take calcium and vitamin D tablets ( a daily recommendation of around 1000mg calcium and 10 mcg Vitamin D).
You can also increase your calcium intake in your diet by including tinned fish, pulses, almonds and oranges.
Iodine is often lacking in the diet of people on Milk/Dairy free diets. Rich sources of Iodine are fish and seaweed.
If your child is formula fed, they can be given extensively hydrolyzed/amino acid formula milk (specialised milk formulas). This formula milk comes from cow's milk but the cow's milk protein is broken down into small peptides and amino acids that are less likely to trigger an allergic reaction.
Please discuss with your Paediatric allergist, what is the optimal extensively hydrolyzed/amino acid formula milk formula for your child.
There is some evidence that hydrolyzed formula milks can provide a balanced nutrition and restore normal growth and development in children who have their growth and development impaired by cow's milk protein allergy*.
Babies who are being weaned and older children with persisting cow's milk protein allergy will need to follow a cow's milk free diet.
* Dupont C, Hol J, Nieuwenhuis EE; An extensively hydrolysed casein-based formula for infants with cows' milk protein allergy: tolerance/hypo-allergenicity and growth catch-up. Br J Nutr. 2015 Apr 14113(7):1102-12. doi: 10.1017/S000711451500015X.