 In the present study, we evaluate the effect of the mother suplementación with DHA during the gestation and lactation on diverse aspects of the development of newborn. The effect on the oxidative stress, inflammatory signaling, bone turnover and piscomotor and visual development was studied. Women will in the sixth month of pregnancy, consume a diet balanced during last 3 months of pregnancy and the whole lactation. In addition the women will divide in two groups: one will receive a supplement of docosahexaenoic acid DHA to evaluate the effects on the development of the newborn child; whereas another group will receive a placebo. Different samples of blood of the mother and of mother milk will be taken and we will correlating her lipidic profile with the brain development of the newborn child, evaluated by different tests. 