Early Routine vs. Selective Human Milk Fortification in Extremely Preterm Infants

Infants will be randomized to two groups. Both groups will be fed Premature Human Milk (either Maternal own milk or Premature donor human milk). However, one group will get fortified with Donor Human Milk Fortifier once full feed is reached while the second group will get fortified using the same fortifier only when weight gain is suboptimal.