[Influence of pre-pregnant BMI and weight gain during pregnancy to weight retention one year after delivery].

OBJECTIVE: To explore the relationship between pre-pregnancy BMI, antepartum weight gain and postpartum weight retention. METHODS: 793 postpartum women from certain district of Hefei city were recruited as the observational cohort at 3rd month after delivery. We obtained antepartum information from pregnancy care management system and conducted questionnaire and measurement at 3, 6, 9 and 12 months postpartum. The observation items included baseline data, antepartum weight, weight gain during pregnancy, weight of different timing during one year after delivery. RESULTS: The proportion of pregnant women whose BMI back to normal during 3, 6, 9 and 12 months were respectively 61.92%, 68.73%, 78.18% and 84.24%. Pre-pregnancy BMI of women's weight gain and weight retention during 3, 6, 9 and 12 months differs. After comparing the differences between higher pre-pregnancy BMI group, medium pre-pregnancy BMI group and lower pre-pregnancy BMI group, the differences were statistically significant. There were independent effects between weight gain during pregnancy, time and postpartum weight recovery, but no interactions were shown between them. CONCLUSION: Pre-pregnancy BMI and weight gain during pregnancy were important factors for postpartum weight retention. Using pre-pregnancy BMI as guidance to build reasonable weight gain during pregnancy might reduce the occurrence of postpartum weight retention and promote postpartum recovery.

[Impact of maternal weight gain during pregnancy on the risk of infant obesity].

OBJECTIVE: To study the impact of maternal weight gain during pregnancy on the risk of infant obesity within 1 year old. METHODS: A total of 785 infants who were born in Hefei and participated children medical care in one district health center and their mothers were chosen as the research subjects from September 2010 to September 2011. Three groups were classified by weight gain during pregnancy according to the percentiles: excessive pregnancy weight gain group of 126 pairs, adequate pregnancy weight gain group of 542 pairs and inadequate pregnancy weight gain group of 117 pairs. Mother's general demographic information was collected. The height and weight were measured when the infant was 42 days, 3, 6, 9, and 12 months of physical examination. Z score was calculated. The differences of Z score in different groups were compared and the RR values of different weight gain during pregnancy on infant obesity were computed. RESULTS: The weight-for-age Z score (WAZ) of infant at 42 days 3, 6, 9 and 12 months in excessive pregnancy weight gain group were 0.23 ± 0.93, 0.25 ± 1.03, 0.23 ± 0.99, 0.28 ± 1.09, 0.26 ± 1.14, respectively, all higher than that of the corresponding age in adequate pregnancy weight gain group (-0.04 ± 1.02, -0.07 ± 0.99, -0.05 ± 0.98, -0.06 ± 0.97, -0.07 ± 0.95, respectively). The differences were statistically significant (all P values < 0.05). In excessive pregnancy weight gain group, infant body mass index (BMI) at 9 months ((18.01 ± 0.15) kg/m(2)) and 12 months ((17.66 ± 0.15) kg/m(2)) were higher than that of adequate pregnancy weight gain group ((17.63 ± 0.13) and (17.22 ± 0.15) kg/m(2), respectively). The differences were statistically significant (all P values < 0.05). Differences of infant Height-for-age Z score (HAZ) among three groups were not statistically significant (all P values > 0.05). Compared to adequate pregnancy weight gain group, RR (95%CI) value of infant obesity in excessive pregnancy weight gain group was 1.86 (1.14 - 3.03). CONCLUSION: Excessive maternal weight gain during pregnancy increased the risk of infant obesity within 1 year old.