A logistic regression analysis will be used to produce odds ratios for the comparison of treatment, blindness and age groups. The between-groups differences in proportion (risk ratio) of patients reporting 'complete resolution' of colic symptoms (PGIS) after first, mid-point and final treatments (primary outcome) and at follow ups (secondary outcomes) Adverse events will be reported with no analysis. Extraction of primary data from crying diaries will be performed by observers blinded to group allocation.