I presume that when you mention that your baby is allergic to nuts you mean peanuts. It is important to know the actual results of his allergy tests to see if he is extremely allergic to the foods or mildly allergic to them As I do not have this information, most important from a possible really severe food allergy reaction is his egg and peanut allergy.
Any cake you buy will need to be both egg and peanut free. Any milk in the cake will be virtually completely altered by the baking process which is usually at a very high temperature of around 180 degrees. Ask at your local health shop if they know of a bakery where you can get the correct type of cake in your area.
You can continue using the Novalac HA2 formula until your baby son is 15 months old. At that stage he should be retested to see if he is still allergic to cow's milk. Based on the result of this tests a decision can be made about what milk to use from then on.
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