METHODS	An open randomized controlled trial was conducted in a large tertiary care hospital , comparing KMC and traditional care for newborn infants weighing less than 2,001 g. Eighty-seven healthy preterm ( < 37 weeks gestational age ) infants from this study provided three blood-spot samples on filter paper : at randomization ( postnatal age 1-5 days ) , 2 weeks later , and at calculated term ( 41 weeks gestational age ) .\