 This study is to support the use of this new amino acid based feed in clinical practice. The study will evaluate the tolerance and acceptability of the amino acid based powdered feed in 20 children aged 1-10yrs of age receiving or requiring an amino acid based feed for the dietary management of CMA and food allergy associated conditions, over 4 weeks. The primary outcome will be gastrointestinal tolerance, with secondary outcomes of compliance, acceptability, nutrient intake and anthropometry. 