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Introducción: La edad gestacional, el peso y la longitud al nacer son factores relacionados con la morbilidad y mortalidad en el período neonatal y en la vida adulta. Sujetos y métodos: Valoración del peso y la longitud vértice-talón al nacer, en 9.362 recién nacidos vivos de raza caucásica (4.884 varones y 4.478 niñas) y de gestaciones únicas (26-42 semanas de edad gestacional), nacidos entre 1999 y 2002 en el Hospital Materno-Infantil Vall d’Hebron de Barcelona y en el Hospital Materno-Infantil Miguel Servet de Zaragoza. Resultados: Valores de la media y desviación estándar, y distribución percentilada del peso y de la longitud en los recién nacidos de ambos sexos según su edad gestacional. Existe un incremento progresivo con la edad gestacional y un dimorfismo sexual a partir de la semana 30 de gestación con diferencias estadísticamente significativas entre ambos sexos para ambos parámetros (p < 0,01) a partir de la semana 35 de edad gestacional. A las 38 y 42 semanas de edad gestacional los valores de la media para el peso y para la longitud son, respectivamente, 170 y 160 g, y 0,8 y 0,9 cm superiores en los varones que en las niñas. También se observó un incremento en los valores de la media de peso y longitud respecto a estudios previos (1987-1992). Conclusiones: Existe un dimorfismo sexual en el peso y la longitud de los recién nacidos pretérmino y a término. Estos parámetros cambian con el tiempo y deben ser revisados periódicamente. : Introduction: Gestational age and neonatal anthropometric parameters are related to neonatal and postnatal morbidity and mortality. Subjects and methods: Weight and vertex-heel length were evaluated in 9.362 caucasian newborns (4.884 males and 4.478 females) products of single pregnancies, 26-42 weeks of gestational age, born between 1999 and 2002 in Vall d’Hebron (Barcelona, Spain) and Miguel Servet (Zaragoza, Spain) Children’s Hospitals. Results: Mean and standard deviation and percentile distribution values of weight, and length according to sex and gestational age are presented. A progressive increase in these parameters with gestational age and a sexual dimorphism was observed from the 30 week of gestational age onwards, with statistically-significant differences (p < 0.01) from 35 weeks of gestational age. At 38 and 42 weeks of gestational ages these differences were 170 g, 160 g, 0,8 cm and 0,9 cm respectively. An increase in weight and length values in relation to previous Spanish studies (1987-1992) was also documented. Conclusions: A sexual dimorphism in intrauterine anthropometric growth parameters was observed. These parameters change with time and may be updated.

Gestational age and neonatal anthropometric parameters are related to neonatal and postnatal morbidity and mortality.Weight and vertex-heel length were evaluated in 9.362 caucasian newborns (4.884 males and 4.478 females) products of single pregnancies, 26-42 weeks of gestational age, born between 1999 and 2002 in Vall d'Hebron (Barcelona, Spain) and Miguel Servet (Zaragoza, Spain) Children's Hospitals.Mean and standard deviation and percentile distribution values of weight, and length according to sex and gestational age are presented. A progressive increase in these parameters with gestational age and a sexual dimorphism was observed from the 30 week of gestational age onwards, with statistically-significant differences (p0.01) from 35 weeks of gestational age. At 38 and 42 weeks of gestational ages these differences were 170 g, 160 g, 0.8 cm and 0.9 cm respectively. An increase in weight and length values in relation to previous Spanish studies (1987-1992) was also documented.A sexual dimorphism in intrauterine anthropometric growth parameters was observed. These parameters change with time and may be updated.

In this paper we report a review of the omphalic pathology that was admitted to our hospital from january 1973 through december 1990. Eleven cases of Beckwith-Wiedemann Syndrome were diagnosed during this period of time. Our eleven cases comply with at least three of the four major criteria (omphalocele, macroglossia, gigantism and neonatal hypoglycemia) and several of the minor criteria. The interest of this paper is based on the rareness of this syndrome and its association in two of our cases with Cacchi-Ricci Syndrome. Moreover, one of these cases later presented with a Wilms' tumor. Finally, we emphasize the importance of an early diagnosis of this syndrome in order to avoid the metabolic disturbances (hypoglycemia), to establish prompt treatment of the serious anomalies (omphalocele) and to control and follow these patients since they have increased risk to develop neoplastic disease.