We investigated leptin concentration in umbilical cord blood of 51 newborns (mean 5.71 +/- 3.28 ng/ml) and in maternal blood (mean 22.11 +/- 10.95 ng/ml). Leptin concentration in 20 preterm infants (mean 4.73 +/- 2.15 ng/ml) was significantly lower (p < 0.05) than in full-term newborns (mean 6.34 +/- 2.08 ng/ml) and tended to increase according to gestational age and birth weight. We suggested leptin concentration had a role in intrauterine development.
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