Background: Intrauterine growth restriction (IUGR) will increase the risk of impairment of renal function in the future. Objective: To assess renal function in infants with a history of IUGR up to 36 weeks gestation compared to infants with normal growth. Method: Laboratory examination of urine microalbumin, urine creatinine and a cystatin C blood test were done on day 7 after birth in infants with a history of IUGR and in infants with normal growth up to 36 weeks gestation and compared. Results: On day 7 after birth, mean urine microalbumin levels of IUGR and normal weight infants were 15.83 ± 31.32 mg/ml and 1.9 ± 0.97 mg/ml respectively (p 0.05). Conclusions: Mean urine albumin level, mean urine creatinine level and mean urine albumin/creatinine ratio of IUGR infants were significantly higher than those of normal weight infants. There was no significant difference between the mean cystatin C levels of IUGR infants and normal weight infants. (Keywords: Renal function of infants with IUGR, microalbumin, creatinine, cystatin C) Sri Lanka Journal of Child Health , 2017; 46 (2): 152-154