ObjectiveTo analyze the change trend of newborn birth weight in Yiwu, Zhejiang province, establish and revise the percentile curve of gestational age specific birth weight of newborns and compare it with different birth weight standards.
MethodsThe data from the Yiwu Maternal and Child Health Information Platform were used to analyze the gestational age specific birth weight, rate of low birth weight and macrosomia in newborns. The LMS method was used to calculate the reference values for percentiles of gestational age specific birth weight. The GAMLSS model was used to draw the birth weight curve. The reference percentile value of the birth weight of this study was compared with domestic and foreign studies.
ResultsA total of 68 358 newborns were included in this study. The average birth weights in male newborns and female newborns were 3 373 g and 3 257 g, respectively. The rates of preterm birth in male newborns and female newborns were 6.01% and 5.04%, respectively. The rate of preterm birth in baby boys was significantly higher than that in baby girls. The rates of low birth weight and macrosomia were 3.84% and 7.43%, respectively. The birth weight of baby boys at gestational age 33–41 weeks was significantly higher than that of female newborns at same gestational age. The birth weight increased with gestational age. The birth weight of baby boys was higher than 2015 national standard at gestational age 37–41 weeks and higher than the reference percentile value of INTERGROWTH-21st study at gestational age 33–41 weeks. The birth weight of female newborns was higher than the 2015 national standard at gestational age 38-41 weeks and higher than the reference percentile value of INTERGROWTH-21st study at gestational age 33, 35–41 weeks.
ConclusionDuring 2007–2018, the birth weight of baby boys in Yiwu showed a decrease with year, and the birth weight of female newborns showed no obvious change. The gender specific birth weight curves of newborns were drawn.
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