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Influence of maternal pregravid weight, height and body mass index on birth weight of male and female newborns.

The study included 2300 healthy couples and their healthy newborns delivered vaginally from singleton, normal term (37-42 weeks) pregnancies in Sibenik, Zadar and Split (Croatia). Both fathers and mothers of male newborns were older and had a higher weight than those of female newborns (p < 0.05). Gestational age and birth weight were higher in male than female newborns (p < 0.001). Increasing maternal pregravid weight led to increasing birth weight of both male and female newborns (p < 0.001). Furthermore, increasing maternal height and body mass index resulted in increasing birth weight of male and female newborns (p < 0.001). Thus, the fathers and mothers of male infants were older than those of female infants (p < 0.05), and increasing pre-gravid body weight, body height and body mass index were associated with a higher birth weight in both male and female newborns.