年纪较轻或身材苗条者,妊娠期可增加营养让体重增加多些。肥胖者只需均衡营养使体重增加少些,让胎儿分享母体过多的脂肪。怀双胎的母亲体重增加在15～20千克为适。正常孕妇妊娠头3个月体重每月增加0.5千克左右,但由于妊娠反应,恶心、呕吐和食欲减退,孕妇常出现体重下降。妊娠3个月以后这些反应消失,食 Older or slimmer, during pregnancy can increase nutrition for more weight gain. Obese just balanced nutrition to make weight gain less, so that the fetus to share too much fat maternal. Pregnant twin womb weight gain in 15 ~ 20 kg as appropriate. Normal pregnant women increased body weight in the first 3 months of pregnancy 0.5 kg per month, but due to pregnancy reaction, nausea, vomiting and loss of appetite, pregnant women often appear weight loss. After 3 months of pregnancy these reactions disappeared, food