With formula feeding your baby will just switch automatically onto the dairy free formula. Some babies really dislike it though so it can be difficult but don’t worry about that unless it’s a situation you have to face.
They say with allergies they can either affect the digestive system and cause symptoms like diarrhoea, vomiting, poor weight gain etc, or they can present via skin complaints, as you can see from different posts on here.
I saw 4 doctors about my babies cradle
Cap and skin and they kept telling me it was baby eczema and kept prescribing creams, but thankfully the 5th doctor said about the CMPA.
I was breastfeeding but he prescribed me 10 tins of dairy free formula there and then.
There is no ‘test’ as such to ascertain if there is an allergy, unless the baby in question has an anaphylactic reaction.
The removal of dairy from the baby’s diet for 6 weeks and observing for positive changes in the baby’s symptoms is what will confirm the diagnosis.
My son was 9 weeks old when the CMPA was initially suggested and he was ultimately allergic to dairy until he 2.5 years old.