1Rasmussen KM, Yaktine AL. Weight gain during pregnancy:reexamining the recommendations CJJ. Washington DC: TheNa-tional Academies Press’2009f 1 (12) :316.
2Sahu MT.Agarwal A,Das V, et al Impact of maternal bodymass index on obstetric outcome[J]. J Obstet Gynaecal Res,2007,33(5):655-659.
3Fiala JE, Egan jF, Lashgari M. The influence of bodymass in-dex on pregnancy outcomes[J]. Conn Med,2006,70 (1): 21-23.