<qa>  What is the gold standard for body weight estimates?C Compare the body composition of VLBW newborns growing in the extrauterine environment upon reaching the corresponding term GA and weight with the body composition of term newborns, using the 3 methods DEXA, air-displacement plethysmography, and electric bioimpedance D Adjust a predictive model for body weight estimates using the parameters furnished by multi-frequency and single-frequency electric bioimpedance and anthropometry, with the measurements provided by DEXA and plethysmography as the gold standard. 