- Preterm newborns (GA ≤ 32 weeks) able to sustain a feeding of at least 100 ml kg-1 day-1 of fortified human milk or standard preterm formula, affected by severe/moderate GER symptomatology (recurrent regurgitations, feeding difficulties, failure to thrive and/or post-prandial desaturations) which usual treatment includes 24h pH-MII diagnostic evaluation.