The smallest of the small: short-term outcomes of profoundly growth restricted and profoundly low birth weight preterm infants.

OBJECTIVE: Survival of preterm and very low birth weight (VLBW) infants has steadily improved. However, the rates of mortality and morbidity among the very smallest infants are poorly characterized.

STUDY DESIGN: Data from the California Perinatal Quality Care Collaborative for the years 2005 to 2012 were used to compare the mortality and morbidity of profoundly low birth weight (ProLBW, birth weight 300 to 500 g) and profoundly small for gestational age (ProSGA,