The purpose of this study is to determine if oxytocin administration immediately after delivery of the infant modifies the volume of placental transfusion in healthy term infants.

Randomized controlled trial with 2 arms to test the influence of oxytocin in placental transfusion. Placental transfusion: the amount of blood that passes to the baby from the time of birth until the cord is clamped. The difference in weight between a measurement at birth and a second one after clamping the cord at 3 minutes will be considered as proxy for placental transfusion. In one arm the oxytocin will be used immediately after birth and the cord clamped at 3 minutes In the other arm the oxytocin will be administered at 3 minutes of birth after the cord is clamped.