胎儿双顶径指的是胎宝宝头部和上下两侧最宽的地区中间的长短，医师都是根据胎宝宝的胎儿双顶径来分辨生长发育是不是一切正常，是否可能是选择顺产等，一般状况下到足月之后都是在9.3公分或是是更大。　　孕13周:胎儿双顶径的均值为2.52士 0.25'胎儿腹围的均值为6.90士l.65'胎儿股骨长为1.17士0.31.　　孕14周:胎儿双顶径的均值为2.83士0.57'胎儿腹围的均值为7.77士1.82'胎儿股骨长为1.38士0.48.　　孕15周:胎儿双顶径的均值为3.23士0.51'胎儿腹围的均值为9.13士1.56'胎儿股骨长为1.74士0.58.　　孕16周:胎儿双顶径的均值为3.62士0.58'胎儿腹围的均值为 10.32士1.92'胎儿股骨长为 2.10士0.51.　　孕17周:胎儿双顶径的均值为3.97士0.44'胎儿腹围的均值为11.49士1.62'胎儿股骨长为 2.52士0.44.　　孕18周:胎儿双顶径的均值为4.25士0.53'胎儿腹围的均值为12.41士l.89'胎儿股骨长为2.71士0.46.　　孕19周:胎儿双顶径的均值为4.52士0.53'胎儿腹围的均值为13.59士2.30'胎儿股骨长为3.03士0.50.　　孕20周:胎儿双顶径的均值为4.88士0.58'胎儿腹围的均值为14.80士l.89'胎儿股骨长为3.35士O.47.　　孕21周:胎儿双顶径的均值为5.22士0.42'胎儿腹围的均值为15.62士1.84'胎儿股骨长为3.64士0.40.　　孕22周:胎儿双顶径的均

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值为5.45士0.57'胎儿腹围的均值为16.70士2.23'胎儿股骨长为3.82士0.47.　　孕23周:胎儿双顶径的均值为5.80士0.44'胎儿腹围的均值为17.90士1.85'胎儿股骨长为4.21士0.41.　　孕24周:胎儿双顶径的均值为6.05士0.50'胎儿腹围的均值为18.74士2.23'胎儿股骨长为4.36士0.51.　　孕25周:胎儿双顶径的均值为6.39士0.70'胎儿腹围的均值为19.64士2.20'胎儿股骨长为4.65士0.42.　　孕26周:胎儿双顶径的均值为6.68士0.61'胎儿腹围的均值为21.62士2.30'胎儿股骨长为4.87士O.41.　　孕27周:胎儿双顶径的均值为6.98士0.57'胎儿腹围的均值为21.81士2.12'胎儿股骨长为5.10士0.41.　　孕28周:胎儿双顶径的均值为7.24士O.65'胎儿腹围的均值为22.86士2.41'胎儿股骨长为5.35士0.55.　　孕29周:胎儿双顶径的均值为7.50士0.65，胎儿腹围的均值为:23.71士1.50'胎儿股骨长的均值为5.61士0.44.　　孕30周:胎儿双顶径的均值为7.83士0.62'胎儿腹围的均值为:24.88士2.03'胎儿股骨长的均值为5.77士0.47.　　孕31周:胎儿双顶径的均值为8.06士0.60'胎儿腹围的均值为:25.78士2.32'胎儿股骨长的均值为6.03士0.38.　　孕32周:胎儿双顶径的均值为8.17士0.65'胎儿腹围的均值为:26.20士2.33'胎儿股骨长的均值为6.43士0.49.　　孕33周:胎儿双顶径的均值为8.50士0.47'胎儿腹围的均值为27.78:士2.30'胎儿股骨长的均值为6.52士0.46.　　孕34周:胎儿双顶径的均值为8.61士0.63'胎儿腹围的均值为:

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27.99士2.55'胎儿股骨长的均值为6.62士0.43.　　孕35周:胎儿双顶径的均值为8.70士0.55'胎儿腹围的均值为:28.74士2.88'胎儿股骨长的均值为6.71士0.45.　　孕36周:胎儿双顶径的均值为8.81士0.57'胎儿腹围的均值为:29.44士2.83'胎儿股骨长的均值为6.95士0.47.　　孕37周:胎儿双顶径的均值为9.00士0.63'胎儿腹围的均值为:30.14士2017'胎儿股骨长的均值为7.10士0.52.　　孕38周:胎儿双顶径的均值为9.08士0.59'胎儿腹围的均值为:30.63士2.83'胎儿股骨长的均值为7.20士0.43.　　孕39周:胎儿双顶径的均值为9.21士0.59'胎儿腹围的均值为:31.34士3.12'胎儿股骨长的均值为7.34士0.53.　　孕40周:胎儿双顶径的均值为9.28士0.50'胎儿腹围的均值为:31.49士2.79'胎儿股骨长的均值为7.4士0.53.