Late (seven days or more following birth) higher may leads to lower postnatal growth failure (weight < 10th percentile) compared with lower sodium intake (low certainty).
It is very uncertain whether late (seven days or more following birth) higher changes necrotising enterocolitis compared with lower sodium intake (very low certainty).
It is very uncertain whether late (seven days or more following birth) higher changes chronic lung disease compared with lower sodium intake (very low certainty).
It is very uncertain whether late (seven days or more following birth) higher changes mortality (latest time reported up to hospital discharge) compared with lower sodium intake (very low certainty).
Early (less than seven days following birth) higher showed no clear difference in mortality (latest time reported up to hospital discharge) compared with lower sodium intake (low certainty).
Early (less than seven days following birth) higher showed no clear difference in hyponatraemia (< 130 mmol/L) compared with lower sodium intake (low certainty).
Early (less than seven days following birth) higher showed no clear difference in hypernatraemia (≥ 150 mmol/L) compared with lower sodium intake (low certainty).
It is very uncertain whether early (less than seven days following birth) higher changes necrotising enterocolitis compared with lower sodium intake (very low certainty).
Adjusted analyses also showed no association between low birth weight and early childhood caries (adjusted OR 1.05, 95% CI 0.71 to 1.57); certainty not graded.
Lower genital tract infection screening probably leads to lower preterm low birthweight (below or equal 2500 g) compared with no screening (moderate certainty).
Lower genital tract infection screening probably leads to lower preterm very low birthweight (below or equal 1500 g) compared with no screening (moderate certainty).
High showed no clear difference in extrauterine growth restriction at discharge compared with standard volume of fortified human milk or preterm formula (low certainty).