This is the latest on the gluten issue http://www.sacn.gov.uk/pdfs/sacn_cot_statement_timing_of_introduction_of_gluten_into_.pdf I guess your attitude to these matters will def be affected if you have a potential allergy issue or coeliac disease, or past experience, good or bad, of 4 or 6m, based on the practicalities or any health issues that arose