[Nutritional support in preterm infants]. 
Extrauterine growth restriction is much popular in China and it is still challenge job for pediatricians.  This article described the benefits for PICC in route of PN choice.  New fat emulsions were appeared recently years, however they are no strong evidence for using in premature infants and need do more clinical trial.  Parenteral nutrition associated with liver damage still is a serious complication of TPN and we encourage early enteral feeding, appropriate calore intake, anti sepsis for prevention.