FABP4 and gestational diabetes: • Elevated FABP4 levels in infants born from GDM mother than in control group.• A further rise of neonatal FABP4 levels within the first 6 h of birth in all infants.• No correlation between FABP4 levels and birth weight in all infants.• An inverse correlation between FABP4 levels and blood glucose in all infants (p = 0.022).