Cognitive ability in adolescents born small for gestational age: Associations with fetal growth velocity, head circumference and postnatal growth

•No difference in IQ score between adolescents born SGA and AGA.•Full-scale IQ was positively related to head circumference.•SGA children with catch-up growth had an increased full-scale IQ score.•Risk factors of SGA may be the link between early growth and cognitive ability.