Hi Huggles,
My little girl (9 months) was b/f until 6 months and from there on she is on NAN 2. So far no negative side effects.
However, I myself was SEVERELY allergic to cow's milk as a child, so have a few suggestions.
Firstly, there is a major difference between lactose intolerance and allergy.
With lactose intolerance, a person's digestive system reacts to the milk SUGAR (lactose) in milk. It gives digestive issues such cramping, runny tummy and in severe cases, vomiting. It does not cause asthma or bronchial smasm. According to studies done, very very few babies/toddlers are lactose intolerant, since your body builds up this intolerance over years.
With an allergy, a person's immune system reacts to a PROTEIN. In cows milk, there are numerous proteins, but the most likely culprits for allergies are whey protein and casein. (I was allergic to whey protein but not casein). These can cause an IMMEDIATE reaction and is usually manifests either by rashes, swelling of the face and throat, bronchial spasm (similar to asthma) or anaphylaxis. I usually got the swelling and the bronchial spasm.
Sorry, very technical, but it is important to understand in order to understand the options
So if you suspect a lactose intolerance (highly unlikely, from everything I read), look for products that does NOT specify milk sugar or lactose on the label. Unfortunately even soy milk has some lactose.
However, if you suspect an allergy, look for products that states NO casein or whey. (Cheddar cheese, for instance contains casein but no whey). Keep them off these proteins for a minimum of two weeks, since it takes 2 weeks for a person's immune response to an allergen to go down. If in two weeks time there are no longer any symptoms, you can start giving products again with the allergen you suspect. But only ONE allergen at a time, and wait ta day. If you get an immune reaction, then you have identified the protein your baby is allergic to.
Some formulas are hypoallergenic, which means the proteins in them have been hydrolised to a point that the immune system will not recognize them as an allergen. This is possibly also an option.
If, however, after two weeks the symptoms continue, you have either not eliminated the correct protein from the diet, or your child is not allergic and is sick due to something else (bacterial/viral infection etc).
Hope this helps!