Gravitas Feeding Tube System Placement in Neonates

Infants in the Newborn Intensive Care Unit requiring a 5Fr NG tube. The desired size of the feeding tube should be determined clinically, and the Gravitas 5Fr Feeding Tube should only be placed if that size is appropriate. Inclusion Criteria: * Age at enrollment: 0 to 18 weeks post-partum. Can be up to 12 weeks preterm (gestational age ≥ 28 weeks). * Suitable to start enteral feeding * Anticipated to receive enteral feeding (either bolus or continuous feeds) for more than 6 hours and conclude the enteral nutrition while in the care of the NICU. If enteral nutrition has already been initiated, indicated for replacement of an orogastric/nasogastric feeding tube. Exclusion Criteria: * Known major upper airway malformation (e.g. tracheoesophageal fistula) * Known major GI malformation (e.g. malrotation) * NPO status -neonate expected to remain NPO for the following 72 hours * Has a medical condition that drastically affects gastric acid-secretion (e.g. Zollinger-Ellison Syndrome, congenital achlorhydria, gastrointestinal perforation/leak/obstruction) * Has had removal of part of the stomach * Critically ill, facing imminent death * Neonate on ECMO * Deemed unsuitable for enrollment in study by the site principal investigator based on the patients' medical history * Ability to have a legally authorized representative provide informed consent Both neonates on a ventilator (non-invasive or invasive ventilation) or not requiring a ventilator are eligible for this study.