Fig. 1: Flow diagram of babies included in analysis.

The number of patients admitted during each cohort period with a gestational age less than 34 weeks and the reasons for exclusion in final analysis. GA gestational age. GI gastrointestinal.

The number of patients admitted during each cohort period with a gestational age less than 34 weeks and the reasons for exclusion in final analysis. GA gestational age. GI gastrointestinal.