IGF I, insulin-like growth factor I; sDs, standard deviation score; WFL, weight-for-length. ↑ = positive correlation; ↓ = negative correlation; → = no correlation; Δ = gain. a Chronological age. b Corrected age. c higher IGF I levels in infants with accelerated previous weight and length gain (a difference of more than 0.67 sDs between two study points).