Breech presentation is a marker of pathological pregnancy and is independently associated with an increased risk of gestational complications. Closer surveillance and appropriate management of pregnancies with breech presentation is warranted to prevent adverse perinatal outcomes.

Introduction and aim: We aimed to provide a current birth weight percentile table for singleton and twin pregnancies stratified by gestational week at delivery and sex using data from all live births in Hungary between 2011 and 2015. In addition, we examined temporal trends in average birth weights in singleton and twin pregnancies by sex in five-year periods between 1996 and 2015. Method: We calculated the 5th, 10th, 25th, 50th, 75th, 90th, and 95th centiles of birth weight for each gestational week by sex for singleton and twin pregnancies using compulsory collected obstetrical data (Tauffer Statistics) in Hungary in 2011–2015. Furthermore, we described changes in birth weights by gestational week between 5-year periods from 1996 to 2015. Results: We present birth weight centiles for live births in both tabular and graphical forms using data from 2011 to 2015. In general, live birth weights in gestational weeks 35–41 were lower in the period of 1996–2005 (the lowest in 1996–2000) and were higher in the period of 2006–2010 compared to the reference period of 2011–2015 (e.g., the average male newborn weighed 3249 g at gestational week 38 in 2011–2015, which is 34.3 [SE at 3.0] g less in 1996–2000, 11.5 [2.9] g less in 2001–2005, and 18.1 [2.9] g more in 2006–2010). Similar trends were not observed in birth weights of twin pregnancies in gestational weeks 35–38. Conclusion: Given the observed substantial change in birth weights during the past 20 years, renewal of the commonly used percentile tables is necessary. Birth weights increased from 1996 to 2010, mainly of mature newborns, followed by a stabilization or slight decrease in the later periods. Orv Hetil. 2019; 160(36): 1426–1436.

Background The increasing birthweight trend stopped and even reversed in several high income countries in the last 20 years, however the reason for these changes is not well characterized. We aimed to analyze the birthweight trends of term deliveries and their potential maternal and fetal drivers in Hungary. Methods We analyzed data from the Hungarian Tauffer registry, a compulsory anonymized data collection of each delivery. We included all singleton term deliveries between in 1999-2018 (n=1 591 932). We modeled birthweight trends separately in 1999-2008 and 2008-2018 in hierarchical multiple linear regression models adjusted for calendar year, newborn sex, maternal age, gestational age at delivery, and other important determinants. Results Median birthweights increased from 3250/3400g (girl/boy) to 3300/3440g from 1999 to 2008 and decreased to 3260/3400g in 2018. When we adjusted for gestational age at delivery the increase in the first period became more pronounced (5.4 g/year). During the second period, similar adjustment substantially decreased the rate of decline from 2.5 to 1.4g/year. Further adjustment for maternal age halved the rate of increase to 2.4g/year in the first period. During the second period, adjustment for maternal age had little effect on the estimate. Conclusions Our findings of an increasing birthweight trend (mostly related to the aging of the mothers) in 1999-2008 may forecast an increased risk of cardiometabolic diseases in offsprings born in this period. In contrast, the decreasing birthweight trends after 2008 may reflect some beneficial effects on perinatal morbidity. However, the long-term effect cannot be predicted, as the trend is mostly explained by the shorter pregnancies.