Study	Reason for exclusion
Ahmed 2020	RCT of early (< 48 h) vs later initiation of progressive enteral feeding in preterm infants
Berseth 2003	Infants were randomly allocated to a stable (not progressively increased) trophic feeding volume or to feed volume advancement at 20 mL/kg/d.
Book 1976	Enteral feeding volumes were advanced at 10 mL/kg/d vs 20 mL/kg/d (both groups received 'slow' advancement of feed volumes).
Gray 2017	RCT of different feeding intervals (not different rates of feed volume advancement) in very preterm infants
Ibrahim 2017	RCT of different feeding intervals (not different rates of feed volume advancement) in very preterm infants
Jayaraman 2017	RCT examining the effect on breast milk feeding of early vs delayed kangaroo mother care in low birth weight infants (no intention to advance enteral feed volumes at different rates)
Kadam 2016	Retrospective cohort study
Nangia 2019	RCT of early full enteral feeding (not progressive advancement at different rates)
Tewari 2018	RCT of early vs delayed initiation of progressive enteral feeding in very preterm infants (feeds were advanced at 10 to 15 mL/kg/d in both groups)
Viswanathan 2017	Retrospective cohort study

RCT: randomised controlled trial