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Objective: To compare fetal growth averaged rythm of single pregnancies with those of pregnancies of twins, according to sex and gestational duration time; and comparing twin male and female newborns. Material and method: Comparisons are taken from the averaged weekly growth of 1.056 male twins and 1.084 twin female newborns, against 19.982 single males and 18.636 single female newborns, respectively. These comparisons are also taken from the 1.056 male twins and the 1.084 female twins. Results: The significant differences between single newborns and twins according to weight averaged growth, seize and cranium perimeter start from the thirty-fourth gestational week. Once male and female twins are compared, significant differences appear in weight and in averaged seize since the thirty-fourth gestational week. However, when cranium perimeters are compared, significant differences don't exist. Conclusion: Each country must have their own fetal growth curves for clasifying newborns accurately., Depto. de Estadística e Investigación Operativa, Fac. de Ciencias Matemáticas, TRUE, pub

Objective: to elaborate twin intrauterine growth curves and standard graphics according to sex and gestational age and perinatology facts of these gestations. Material and methods: to study anthropometry at birth (weight, height and head circumference) of 1116 couples of twins born at Hospital Clínico San Carlos de Madrid. A transversal descriptive analysis has been used. Results: growth curves and graphics of 1056 healthy male twins and 1086 healthy female twins coming from non patology pregnancies with percentiled (3,10,25,50,75,90,97) are shown. Conclusions: each population group must have their own fetal growth curves so we can clasify newborns in preterm, in term and post-term and in big, normal and small acording to gestational age., Depto. de Estadística e Investigación Operativa, Fac. de Ciencias Matemáticas, TRUE, pub