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Between 1988-1922, data of the nutritional status of pregnant women seen in the Santiago Metropolitan Health Service were analyzed. Underweight (22.2%), normal weight (47.2%), overweight (19.7%) and Obese (15.4%). Four thousand five hundred fifty five pregnant women were studied. Underweight 1136, normal weight 1219, overweight 1100 and obese 1100. Underweight was significantly more frequent in the patients less than 20 years old while overweight and obese was significantly more frequent in the patients over 30 years old. Hypertension (2.6%) was the only significant morbidity factor in the obese group. The overweight and obese groups had earlier menarche, while the obese group had shorter periods. The obese group were associated most frequently with higher parity (75.1%), stillbirth (4.6%), spontaneous abortion (19.5%), induced abortion (3.1%) and high obstetric risk (33.2%). In the normogram used, the underweight patients are abnormally represented at the start of pregnancy. The obese group gained less weight proportionally during pregnancy (overweight and obese 42.8%, underweight and normal 34.7%). The obese group presented more frequently with hypertension (20.4%) and diabetes (0.7%), while the obstetric complications occurred more frequently in the underweight (6.3%). The underwent group had more anemia (45.4%) and premature labor (12.3%). Cesarean section was performed more frequently in the obese group (33.1% versus 21.3% of all the other groups combined. The neonatal birthweight was in direct proportion to the maternal weight, measured by various methods. It is worth noting the importance of microelements in the milk ingestion of the pregnant patients and the influence on their weight.