Article Protein Needs of Preterm Infants: Why Are They So Difficult to Meet? 19 min read Add to favorite You need to log in or register to add to your favorites. Share Protein Needs of Preterm Infants: Why Are They So Difficult to Meet? (abs doc) Protein Needs of Preterm Infants: Why Are They So Difficult to Meet? (full doc) Ekhard E. Ziegler Prof.