Other studies did not observe greater weight and length gain among premature babies receiving a formula, with results similar to those detected in the present study. A review study conducted on 400 preterm babies with a gestational age ≤30 weeks observed a lower prevalence of necrotizing enterocolitis and retinopathy of prematurity, with no significant differences in weight gain in infants fed maternal milk compared to infants receiving a formula (21). Cristofalo et al. (22) studied 1979 premature infants with a mean gestational age of 27 weeks and observed no significant differences in weight-height gain or head circumference growth between infants fed maternal milk and infants receiving a formula.