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| The relationship between different conception time and gestational weight gain or abnormal birth weight |
| 1.National Center for Women and Children's Health, China CDC, Beijing, 100081; 2. Department of Epidemiology and Biostatistics, School of Public Health, Peking University Health Science Center, Institute of Reproductive and Child Health, Ministry of Health Key Laboratory of Reproductive Health |
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Abstract To explore the relationship between different conception time and gestational weight gain or abnormal birth weight. Methods: From October 2013 to September 2015, 29711 maternal and newborn who recorded in 12 counties of 6 provinces joining the health care systerm of national center for women and children’s health, China CDC were selected. The multiple logistic regression analysis was used to survey the correlation between different conception time and gestational weight gain or abnormal birth weight. Adjustment factors included maternal age, education, prepregnant BMI, district, and fetal sex. Results: The incidence of macrosomia was 5.9%, while incidence of small for gestational age of infants was 1.3%. During the autumn, the onset of pregnancy decreased the risk of macrosomia, when compared to that during the spring, the adjusted OR (95% CI) of incidence of macrosomia during the autumn was 0.76 and 0.660.88. The onset of pregnancy during the autumn and winter reduced the risk of weight gain too much of pregnant women. When compared to that during the spring, the adjusted OR (95% CI) of incidence of weight gain of pregnant women during the summer, the autumn, and the winter were 0.84 (0.760.91), 0.46 (0.420.50) and 0.42 (0.510.61), respectively. Conclusion: The seasonal pattern in abnormal birth weight was related to seasonality of gestational weight gain. Both the rate of gestational weight gain and the incidence of macrosomia were lower when women who become to pregnancy in autumn, which has suggested that pregnant women with high risk factors of macrosomia maybe choose to conception in fall.
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