This is a protocol for a Cochrane Review (Intervention). The objectives are as follows: To determine the effects of higher versus lower sodium supplementation in preterm infants. We will undertake three comparisons. 1. Higher (commencing ≥ 2 mmol/kg/day) versus lower (commencing < 2 mmol/kg/day) sodium supplementation in preterm infants less than 7 days of age.
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