[Esophageal pH measurement in newborn infants under 1,700 gms].

Esophageal pH was systematically recorded for 3 hours in 30 neonates under 1,700 g, of which 18 were under assisted ventilation. Gastric acid secretion occurs early. Varying degrees of gastroesophageal reflux were observed in 21 neonates. Positioning in the prone position at 30 degrees allowed for the disappearance of reflux in 19 and an improvement in the remaining 2. We recommend the adoption of this position in all premature infants including those under assisted ventilation.