20周宫颈长31mm,要担心么!# NextGeneration - 我爱宝宝
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http://www.keepemcookin.com/prevention.aspx/
The length of the cervix is expected to shorten as a pregnancy progresses,
but a length of 3.0 cm to 3.5 cm isn't expected until 32 to 36 weeks:
At 16 to 20 weeks, normal cervical length is 4.0 to 4.5 cm
At 24 to 28 weeks, normal cervical length is 3.5 to 4.0 cm
At 32 to 36 weeks, normal cervical length is 3.0 to 3.5 cm
The length of the cervix is expected to shorten as a pregnancy progresses,
but a length of 3.0 cm to 3.5 cm isn't expected until 32 to 36 weeks:
At 16 to 20 weeks, normal cervical length is 4.0 to 4.5 cm
At 24 to 28 weeks, normal cervical length is 3.5 to 4.0 cm
At 32 to 36 weeks, normal cervical length is 3.0 to 3.5 cm