To collect cord plasma in preterm and term infants. To collect remnants of clinically indicated blood samples in parturients and hospitalized preterm infants during neonatal intensive care.~To determine concentrations of choline, its metabolites, and phospholipids by mass spectrometry.~To compare cord plasma concentrations with postnatal plasma concentrations.
To study concentrations of choline, its metabolites, and phospholipids in cord blood and remnants of clinically indicated blood samples